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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 |
|---|---|
| 3072 | * Filters the JOIN clause of the query. |
| 3073 | * |
| 3074 | * For use by caching plugins. |
| 3075 | * |
| 3076 | * @since 2.5.0 |
| 3077 | * |
| 3078 | * @param string $join The JOIN clause of the query. |
| 3079 | * @param WP_Query $query The WP_Query instance (passed by reference). |
| 3080 | */ |
| 3081 | $join = apply_filters_ref_array( 'posts_join_request', array( $join, &$this ) ); |
| 3082 | |
| 3083 | /** |
| 3084 | * Filters the ORDER BY clause of the query. |
| 3085 | * |
| 3086 | * For use by caching plugins. |
| 3087 | * |
| 3088 | * @since 2.5.0 |
| 3089 | * |
| 3090 | * @param string $orderby The ORDER BY clause of the query. |