660 lines
19 KiB
PHP
660 lines
19 KiB
PHP
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<?php
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/**
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* Taxonomy API: WP_Tax_Query class
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*
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* @package WordPress
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* @subpackage Taxonomy
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* @since 4.4.0
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*/
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/**
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* Core class used to implement taxonomy queries for the Taxonomy API.
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*
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* Used for generating SQL clauses that filter a primary query according to object
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* taxonomy terms.
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*
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* WP_Tax_Query is a helper that allows primary query classes, such as WP_Query, to filter
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* their results by object metadata, by generating `JOIN` and `WHERE` subclauses to be
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* attached to the primary SQL query string.
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*
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* @since 3.1.0
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*/
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#[AllowDynamicProperties]
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class WP_Tax_Query {
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/**
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* Array of taxonomy queries.
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*
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* See WP_Tax_Query::__construct() for information on tax query arguments.
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*
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* @since 3.1.0
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* @var array
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*/
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public $queries = array();
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/**
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* The relation between the queries. Can be one of 'AND' or 'OR'.
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*
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* @since 3.1.0
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* @var string
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*/
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public $relation;
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/**
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* Standard response when the query should not return any rows.
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*
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* @since 3.2.0
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* @var string
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*/
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private static $no_results = array(
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'join' => array( '' ),
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'where' => array( '0 = 1' ),
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);
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/**
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* A flat list of table aliases used in the JOIN clauses.
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*
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* @since 4.1.0
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* @var array
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*/
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protected $table_aliases = array();
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/**
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* Terms and taxonomies fetched by this query.
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*
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* We store this data in a flat array because they are referenced in a
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* number of places by WP_Query.
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*
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* @since 4.1.0
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* @var array
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*/
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public $queried_terms = array();
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/**
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* Database table that where the metadata's objects are stored (eg $wpdb->users).
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*
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* @since 4.1.0
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* @var string
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*/
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public $primary_table;
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/**
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* Column in 'primary_table' that represents the ID of the object.
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*
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* @since 4.1.0
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* @var string
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*/
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public $primary_id_column;
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/**
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* Constructor.
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*
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* @since 3.1.0
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* @since 4.1.0 Added support for `$operator` 'NOT EXISTS' and 'EXISTS' values.
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*
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* @param array $tax_query {
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* Array of taxonomy query clauses.
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*
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* @type string $relation Optional. The MySQL keyword used to join
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* the clauses of the query. Accepts 'AND', or 'OR'. Default 'AND'.
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* @type array ...$0 {
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* An array of first-order clause parameters, or another fully-formed tax query.
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*
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* @type string $taxonomy Taxonomy being queried. Optional when field=term_taxonomy_id.
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* @type string|int|array $terms Term or terms to filter by.
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* @type string $field Field to match $terms against. Accepts 'term_id', 'slug',
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* 'name', or 'term_taxonomy_id'. Default: 'term_id'.
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* @type string $operator MySQL operator to be used with $terms in the WHERE clause.
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* Accepts 'AND', 'IN', 'NOT IN', 'EXISTS', 'NOT EXISTS'.
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* Default: 'IN'.
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* @type bool $include_children Optional. Whether to include child terms.
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* Requires a $taxonomy. Default: true.
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* }
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* }
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*/
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public function __construct( $tax_query ) {
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if ( isset( $tax_query['relation'] ) ) {
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$this->relation = $this->sanitize_relation( $tax_query['relation'] );
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} else {
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$this->relation = 'AND';
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}
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$this->queries = $this->sanitize_query( $tax_query );
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}
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/**
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* Ensures the 'tax_query' argument passed to the class constructor is well-formed.
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*
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* Ensures that each query-level clause has a 'relation' key, and that
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* each first-order clause contains all the necessary keys from `$defaults`.
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*
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* @since 4.1.0
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*
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* @param array $queries Array of queries clauses.
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* @return array Sanitized array of query clauses.
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*/
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public function sanitize_query( $queries ) {
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$cleaned_query = array();
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$defaults = array(
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'taxonomy' => '',
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'terms' => array(),
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'field' => 'term_id',
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'operator' => 'IN',
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'include_children' => true,
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);
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foreach ( $queries as $key => $query ) {
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if ( 'relation' === $key ) {
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$cleaned_query['relation'] = $this->sanitize_relation( $query );
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// First-order clause.
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} elseif ( self::is_first_order_clause( $query ) ) {
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$cleaned_clause = array_merge( $defaults, $query );
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$cleaned_clause['terms'] = (array) $cleaned_clause['terms'];
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$cleaned_query[] = $cleaned_clause;
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/*
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* Keep a copy of the clause in the flate
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* $queried_terms array, for use in WP_Query.
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*/
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if ( ! empty( $cleaned_clause['taxonomy'] ) && 'NOT IN' !== $cleaned_clause['operator'] ) {
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$taxonomy = $cleaned_clause['taxonomy'];
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if ( ! isset( $this->queried_terms[ $taxonomy ] ) ) {
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$this->queried_terms[ $taxonomy ] = array();
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}
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/*
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* Backward compatibility: Only store the first
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* 'terms' and 'field' found for a given taxonomy.
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*/
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if ( ! empty( $cleaned_clause['terms'] ) && ! isset( $this->queried_terms[ $taxonomy ]['terms'] ) ) {
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$this->queried_terms[ $taxonomy ]['terms'] = $cleaned_clause['terms'];
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}
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if ( ! empty( $cleaned_clause['field'] ) && ! isset( $this->queried_terms[ $taxonomy ]['field'] ) ) {
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$this->queried_terms[ $taxonomy ]['field'] = $cleaned_clause['field'];
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}
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}
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// Otherwise, it's a nested query, so we recurse.
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} elseif ( is_array( $query ) ) {
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$cleaned_subquery = $this->sanitize_query( $query );
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if ( ! empty( $cleaned_subquery ) ) {
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// All queries with children must have a relation.
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if ( ! isset( $cleaned_subquery['relation'] ) ) {
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$cleaned_subquery['relation'] = 'AND';
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}
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$cleaned_query[] = $cleaned_subquery;
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}
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}
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}
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return $cleaned_query;
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}
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/**
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* Sanitizes a 'relation' operator.
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*
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* @since 4.1.0
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*
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* @param string $relation Raw relation key from the query argument.
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* @return string Sanitized relation. Either 'AND' or 'OR'.
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*/
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public function sanitize_relation( $relation ) {
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if ( 'OR' === strtoupper( $relation ) ) {
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return 'OR';
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} else {
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return 'AND';
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}
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}
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/**
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* Determines whether a clause is first-order.
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*
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* A "first-order" clause is one that contains any of the first-order
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* clause keys ('terms', 'taxonomy', 'include_children', 'field',
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* 'operator'). An empty clause also counts as a first-order clause,
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* for backward compatibility. Any clause that doesn't meet this is
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* determined, by process of elimination, to be a higher-order query.
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*
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* @since 4.1.0
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*
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* @param array $query Tax query arguments.
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* @return bool Whether the query clause is a first-order clause.
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*/
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protected static function is_first_order_clause( $query ) {
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return is_array( $query ) && ( empty( $query ) || array_key_exists( 'terms', $query ) || array_key_exists( 'taxonomy', $query ) || array_key_exists( 'include_children', $query ) || array_key_exists( 'field', $query ) || array_key_exists( 'operator', $query ) );
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}
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/**
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* Generates SQL clauses to be appended to a main query.
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*
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* @since 3.1.0
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*
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* @param string $primary_table Database table where the object being filtered is stored (eg wp_users).
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* @param string $primary_id_column ID column for the filtered object in $primary_table.
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* @return string[] {
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* Array containing JOIN and WHERE SQL clauses to append to the main query.
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*
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* @type string $join SQL fragment to append to the main JOIN clause.
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* @type string $where SQL fragment to append to the main WHERE clause.
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* }
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*/
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public function get_sql( $primary_table, $primary_id_column ) {
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$this->primary_table = $primary_table;
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$this->primary_id_column = $primary_id_column;
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return $this->get_sql_clauses();
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}
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/**
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* Generates SQL clauses to be appended to a main query.
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*
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* Called by the public WP_Tax_Query::get_sql(), this method
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* is abstracted out to maintain parity with the other Query classes.
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*
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* @since 4.1.0
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*
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* @return string[] {
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* Array containing JOIN and WHERE SQL clauses to append to the main query.
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*
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* @type string $join SQL fragment to append to the main JOIN clause.
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* @type string $where SQL fragment to append to the main WHERE clause.
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* }
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*/
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protected function get_sql_clauses() {
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/*
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* $queries are passed by reference to get_sql_for_query() for recursion.
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* To keep $this->queries unaltered, pass a copy.
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*/
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$queries = $this->queries;
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$sql = $this->get_sql_for_query( $queries );
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if ( ! empty( $sql['where'] ) ) {
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$sql['where'] = ' AND ' . $sql['where'];
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}
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return $sql;
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}
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/**
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* Generates SQL clauses for a single query array.
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*
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* If nested subqueries are found, this method recurses the tree to
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* produce the properly nested SQL.
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*
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* @since 4.1.0
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*
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* @param array $query Query to parse (passed by reference).
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* @param int $depth Optional. Number of tree levels deep we currently are.
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* Used to calculate indentation. Default 0.
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* @return string[] {
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* Array containing JOIN and WHERE SQL clauses to append to a single query array.
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*
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* @type string $join SQL fragment to append to the main JOIN clause.
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* @type string $where SQL fragment to append to the main WHERE clause.
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* }
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*/
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protected function get_sql_for_query( &$query, $depth = 0 ) {
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$sql_chunks = array(
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'join' => array(),
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'where' => array(),
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);
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$sql = array(
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'join' => '',
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'where' => '',
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);
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$indent = '';
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for ( $i = 0; $i < $depth; $i++ ) {
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$indent .= ' ';
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}
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foreach ( $query as $key => &$clause ) {
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if ( 'relation' === $key ) {
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$relation = $query['relation'];
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} elseif ( is_array( $clause ) ) {
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// This is a first-order clause.
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if ( $this->is_first_order_clause( $clause ) ) {
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$clause_sql = $this->get_sql_for_clause( $clause, $query );
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$where_count = count( $clause_sql['where'] );
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if ( ! $where_count ) {
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$sql_chunks['where'][] = '';
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} elseif ( 1 === $where_count ) {
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$sql_chunks['where'][] = $clause_sql['where'][0];
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} else {
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$sql_chunks['where'][] = '( ' . implode( ' AND ', $clause_sql['where'] ) . ' )';
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}
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$sql_chunks['join'] = array_merge( $sql_chunks['join'], $clause_sql['join'] );
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// This is a subquery, so we recurse.
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} else {
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$clause_sql = $this->get_sql_for_query( $clause, $depth + 1 );
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$sql_chunks['where'][] = $clause_sql['where'];
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$sql_chunks['join'][] = $clause_sql['join'];
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}
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}
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}
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// Filter to remove empties.
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$sql_chunks['join'] = array_filter( $sql_chunks['join'] );
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$sql_chunks['where'] = array_filter( $sql_chunks['where'] );
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if ( empty( $relation ) ) {
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$relation = 'AND';
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}
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// Filter duplicate JOIN clauses and combine into a single string.
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if ( ! empty( $sql_chunks['join'] ) ) {
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$sql['join'] = implode( ' ', array_unique( $sql_chunks['join'] ) );
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}
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// Generate a single WHERE clause with proper brackets and indentation.
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if ( ! empty( $sql_chunks['where'] ) ) {
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$sql['where'] = '( ' . "\n " . $indent . implode( ' ' . "\n " . $indent . $relation . ' ' . "\n " . $indent, $sql_chunks['where'] ) . "\n" . $indent . ')';
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}
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return $sql;
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}
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/**
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* Generates SQL JOIN and WHERE clauses for a "first-order" query clause.
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*
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* @since 4.1.0
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*
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* @global wpdb $wpdb The WordPress database abstraction object.
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*
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* @param array $clause Query clause (passed by reference).
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* @param array $parent_query Parent query array.
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* @return array {
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* Array containing JOIN and WHERE SQL clauses to append to a first-order query.
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*
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* @type string[] $join Array of SQL fragments to append to the main JOIN clause.
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* @type string[] $where Array of SQL fragments to append to the main WHERE clause.
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* }
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*/
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public function get_sql_for_clause( &$clause, $parent_query ) {
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global $wpdb;
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$sql = array(
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'where' => array(),
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'join' => array(),
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);
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$join = '';
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$where = '';
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$this->clean_query( $clause );
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if ( is_wp_error( $clause ) ) {
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return self::$no_results;
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}
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$terms = $clause['terms'];
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$operator = strtoupper( $clause['operator'] );
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if ( 'IN' === $operator ) {
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if ( empty( $terms ) ) {
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return self::$no_results;
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}
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$terms = implode( ',', $terms );
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/*
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* Before creating another table join, see if this clause has a
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* sibling with an existing join that can be shared.
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*/
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$alias = $this->find_compatible_table_alias( $clause, $parent_query );
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if ( false === $alias ) {
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$i = count( $this->table_aliases );
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$alias = $i ? 'tt' . $i : $wpdb->term_relationships;
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// Store the alias as part of a flat array to build future iterators.
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$this->table_aliases[] = $alias;
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// Store the alias with this clause, so later siblings can use it.
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$clause['alias'] = $alias;
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$join .= " LEFT JOIN $wpdb->term_relationships";
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$join .= $i ? " AS $alias" : '';
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$join .= " ON ($this->primary_table.$this->primary_id_column = $alias.object_id)";
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}
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$where = "$alias.term_taxonomy_id $operator ($terms)";
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} elseif ( 'NOT IN' === $operator ) {
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if ( empty( $terms ) ) {
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return $sql;
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}
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$terms = implode( ',', $terms );
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$where = "$this->primary_table.$this->primary_id_column NOT IN (
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SELECT object_id
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FROM $wpdb->term_relationships
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WHERE term_taxonomy_id IN ($terms)
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)";
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} elseif ( 'AND' === $operator ) {
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if ( empty( $terms ) ) {
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return $sql;
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}
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$num_terms = count( $terms );
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$terms = implode( ',', $terms );
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$where = "(
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SELECT COUNT(1)
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FROM $wpdb->term_relationships
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WHERE term_taxonomy_id IN ($terms)
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AND object_id = $this->primary_table.$this->primary_id_column
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) = $num_terms";
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} elseif ( 'NOT EXISTS' === $operator || 'EXISTS' === $operator ) {
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$where = $wpdb->prepare(
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"$operator (
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SELECT 1
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FROM $wpdb->term_relationships
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INNER JOIN $wpdb->term_taxonomy
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ON $wpdb->term_taxonomy.term_taxonomy_id = $wpdb->term_relationships.term_taxonomy_id
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WHERE $wpdb->term_taxonomy.taxonomy = %s
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AND $wpdb->term_relationships.object_id = $this->primary_table.$this->primary_id_column
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)",
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$clause['taxonomy']
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);
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}
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$sql['join'][] = $join;
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$sql['where'][] = $where;
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return $sql;
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}
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/**
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* Identifies an existing table alias that is compatible with the current query clause.
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*
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* We avoid unnecessary table joins by allowing each clause to look for
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* an existing table alias that is compatible with the query that it
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* needs to perform.
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*
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* An existing alias is compatible if (a) it is a sibling of `$clause`
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* (ie, it's under the scope of the same relation), and (b) the combination
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* of operator and relation between the clauses allows for a shared table
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* join. In the case of WP_Tax_Query, this only applies to 'IN'
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* clauses that are connected by the relation 'OR'.
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*
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* @since 4.1.0
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*
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* @param array $clause Query clause.
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* @param array $parent_query Parent query of $clause.
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* @return string|false Table alias if found, otherwise false.
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*/
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protected function find_compatible_table_alias( $clause, $parent_query ) {
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$alias = false;
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// Confidence check. Only IN queries use the JOIN syntax.
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if ( ! isset( $clause['operator'] ) || 'IN' !== $clause['operator'] ) {
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return $alias;
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}
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// Since we're only checking IN queries, we're only concerned with OR relations.
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if ( ! isset( $parent_query['relation'] ) || 'OR' !== $parent_query['relation'] ) {
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return $alias;
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}
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$compatible_operators = array( 'IN' );
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foreach ( $parent_query as $sibling ) {
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if ( ! is_array( $sibling ) || ! $this->is_first_order_clause( $sibling ) ) {
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continue;
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}
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if ( empty( $sibling['alias'] ) || empty( $sibling['operator'] ) ) {
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continue;
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}
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// The sibling must both have compatible operator to share its alias.
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if ( in_array( strtoupper( $sibling['operator'] ), $compatible_operators, true ) ) {
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$alias = preg_replace( '/\W/', '_', $sibling['alias'] );
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break;
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}
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}
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return $alias;
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}
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/**
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* Validates a single query.
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*
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* @since 3.2.0
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*
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* @param array $query The single query. Passed by reference.
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*/
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private function clean_query( &$query ) {
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if ( empty( $query['taxonomy'] ) ) {
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if ( 'term_taxonomy_id' !== $query['field'] ) {
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$query = new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy.' ) );
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return;
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}
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// So long as there are shared terms, 'include_children' requires that a taxonomy is set.
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$query['include_children'] = false;
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} elseif ( ! taxonomy_exists( $query['taxonomy'] ) ) {
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$query = new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy.' ) );
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return;
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}
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if ( 'slug' === $query['field'] || 'name' === $query['field'] ) {
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$query['terms'] = array_unique( (array) $query['terms'] );
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} else {
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$query['terms'] = wp_parse_id_list( $query['terms'] );
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}
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if ( is_taxonomy_hierarchical( $query['taxonomy'] ) && $query['include_children'] ) {
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$this->transform_query( $query, 'term_id' );
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if ( is_wp_error( $query ) ) {
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return;
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}
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$children = array();
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foreach ( $query['terms'] as $term ) {
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$children = array_merge( $children, get_term_children( $term, $query['taxonomy'] ) );
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$children[] = $term;
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}
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$query['terms'] = $children;
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}
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$this->transform_query( $query, 'term_taxonomy_id' );
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}
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/**
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* Transforms a single query, from one field to another.
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*
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* Operates on the `$query` object by reference. In the case of error,
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* `$query` is converted to a WP_Error object.
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*
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* @since 3.2.0
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*
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* @param array $query The single query. Passed by reference.
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* @param string $resulting_field The resulting field. Accepts 'slug', 'name', 'term_taxonomy_id',
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* or 'term_id'. Default 'term_id'.
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*/
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public function transform_query( &$query, $resulting_field ) {
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if ( empty( $query['terms'] ) ) {
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return;
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}
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if ( $query['field'] === $resulting_field ) {
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return;
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}
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$resulting_field = sanitize_key( $resulting_field );
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// Empty 'terms' always results in a null transformation.
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$terms = array_filter( $query['terms'] );
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if ( empty( $terms ) ) {
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$query['terms'] = array();
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$query['field'] = $resulting_field;
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return;
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}
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$args = array(
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'get' => 'all',
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'number' => 0,
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'taxonomy' => $query['taxonomy'],
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'update_term_meta_cache' => false,
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'orderby' => 'none',
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);
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// Term query parameter name depends on the 'field' being searched on.
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switch ( $query['field'] ) {
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case 'slug':
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$args['slug'] = $terms;
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break;
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case 'name':
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$args['name'] = $terms;
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break;
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case 'term_taxonomy_id':
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$args['term_taxonomy_id'] = $terms;
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break;
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default:
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$args['include'] = wp_parse_id_list( $terms );
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break;
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}
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if ( ! is_taxonomy_hierarchical( $query['taxonomy'] ) ) {
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$args['number'] = count( $terms );
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}
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$term_query = new WP_Term_Query();
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$term_list = $term_query->query( $args );
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if ( is_wp_error( $term_list ) ) {
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$query = $term_list;
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return;
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}
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if ( 'AND' === $query['operator'] && count( $term_list ) < count( $query['terms'] ) ) {
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$query = new WP_Error( 'inexistent_terms', __( 'Inexistent terms.' ) );
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return;
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}
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$query['terms'] = wp_list_pluck( $term_list, $resulting_field );
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$query['field'] = $resulting_field;
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}
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}
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