wp-includes/class-wp-query.php:1176Parses various taxonomy related query vars.
$query_varsarrayOne hook fires while WP_Query::parse_tax_query() runs, in this order:
Fires after taxonomy-related query vars have been parsed.
public function parse_tax_query( &$query_vars ) { if ( ! empty( $query_vars['tax_query'] ) && is_array( $query_vars['tax_query'] ) ) { $tax_query = $query_vars['tax_query']; } else { $tax_query = array(); } if ( ! empty( $query_vars['taxonomy'] ) && ! empty( $query_vars['term'] ) ) { $tax_query[] = array( 'taxonomy' => $query_vars['taxonomy'], 'terms' => array( $query_vars['term'] ), 'field' => 'slug', ); } foreach ( get_taxonomies( array(), 'objects' ) as $taxonomy => $t ) { if ( 'post_tag' === $taxonomy ) { continue; // Handled further down in the $query_vars['tag'] block. } if ( $t->query_var && ! empty( $query_vars[ $t->query_var ] ) ) { $tax_query_defaults = array( 'taxonomy' => $taxonomy, 'field' => 'slug', ); if ( is_string( $query_vars[ $t->query_var ] ) && ! empty( $t->rewrite['hierarchical'] ) ) { $query_vars[ $t->query_var ] = wp_basename( $query_vars[ $t->query_var ] ); } $term = $query_vars[ $t->query_var ]; if ( ! is_array( $term ) ) { $term = explode( ',', $term ); $term = array_map( 'trim', $term ); } sort( $term ); $term = implode( ',', $term ); if ( str_contains( $term, '+' ) ) { $terms = preg_split( '/[+]+/', $term ); foreach ( $terms as $term ) { $tax_query[] = array_merge( $tax_query_defaults, array( 'terms' => array( $term ), ) ); } } else { $tax_query[] = array_merge( $tax_query_defaults, array( 'terms' => preg_split( '/[,]+/', $term ), ) ); } } } // If query string 'cat' is an array, implode it. if ( is_array( $query_vars['cat'] ) ) { $query_vars['cat'] = implode( ',', $query_vars['cat'] ); } // Category stuff. if ( ! empty( $query_vars['cat'] ) && ! $this->is_singular ) { $cat_in = array(); $cat_not_in = array(); $cat_array = preg_split( '/[,\s]+/', urldecode( $query_vars['cat'] ) ); $cat_array = array_map( 'intval', $cat_array ); sort( $cat_array ); $query_vars['cat'] = implode( ',', $cat_array ); foreach ( $cat_array as $cat ) { if ( $cat > 0 ) { $cat_in[] = $cat; } elseif ( $cat < 0 ) {Introduced in 3.1.0. 2 changes between 6.7.7 and 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
$query_vars added.verified against source$q removed.verified against sourcesrc/wp-includes/class-wp-query.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.