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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 |
|---|---|
| 2813 | |
| 2814 | /** |
| 2815 | * Filter the search SQL that is used in the WHERE clause of WP_Query. |
| 2816 | * |
| 2817 | * @since 3.0.0 |
| 2818 | * |
| 2819 | * @param string $search Search SQL for WHERE clause. |
| 2820 | * @param WP_Query $this The current WP_Query object. |
| 2821 | */ |
| 2822 | $search = apply_filters_ref_array( 'posts_search', array( $search, &$this ) ); |
| 2823 | |
| 2824 | // Taxonomies |
| 2825 | if ( !$this->is_singular ) { |
| 2826 | $this->parse_tax_query( $q ); |
| 2827 | |
| 2828 | $clauses = $this->tax_query->get_sql( $wpdb->posts, 'ID' ); |
| 2829 | |
| 2830 | $join .= $clauses['join']; |
| 2831 | $where .= $clauses['where']; |