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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 |
|---|---|
| 3064 | if ( !$q['suppress_filters'] ) { |
| 3065 | /** |
| 3066 | * Filter the WHERE clause of the query. |
| 3067 | * |
| 3068 | * @since 1.5.0 |
| 3069 | * |
| 3070 | * @param string $where The WHERE clause of the query. |
| 3071 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
| 3072 | */ |
| 3073 | $where = apply_filters_ref_array( 'posts_where', array( $where, &$this ) ); |
| 3074 | |
| 3075 | /** |
| 3076 | * Filter the JOIN clause of the query. |
| 3077 | * |
| 3078 | * @since 1.5.0 |
| 3079 | * |
| 3080 | * @param string $where The JOIN clause of the query. |
| 3081 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
| 3082 | */ |