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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 |
|---|---|
| 3024 | if ( !$q['suppress_filters'] ) { |
| 3025 | /** |
| 3026 | * Filter the WHERE clause of the query. |
| 3027 | * |
| 3028 | * @since 1.5.0 |
| 3029 | * |
| 3030 | * @param string $where The WHERE clause of the query. |
| 3031 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
| 3032 | */ |
| 3033 | $where = apply_filters_ref_array( 'posts_where', array( $where, &$this ) ); |
| 3034 | |
| 3035 | /** |
| 3036 | * Filter the JOIN clause of the query. |
| 3037 | * |
| 3038 | * @since 1.5.0 |
| 3039 | * |
| 3040 | * @param string $where The JOIN clause of the query. |
| 3041 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
| 3042 | */ |