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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )
apply_filters( "hook_name", "what_to_filter" )
.Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
Line | Code |
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2667 |
|
2668 | /** |
2669 | * Filter the search SQL that is used in the WHERE clause of WP_Query. |
2670 | * |
2671 | * @since 3.0.0 |
2672 | * |
2673 | * @param string $search Search SQL for WHERE clause. |
2674 | * @param WP_Query $this The current WP_Query object. |
2675 | */ |
2676 | $search = apply_filters_ref_array( 'posts_search', array( $search, &$this ) ); |
2677 |
|
2678 | // Taxonomies |
2679 | if ( !$this->is_singular ) { |
2680 | $this->parse_tax_query( $q ); |
2681 |
|
2682 | $clauses = $this->tax_query->get_sql( $wpdb->posts, 'ID' ); |
2683 |
|
2684 | $join .= $clauses['join']; |
2685 | $where .= $clauses['where']; |