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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 |
|---|---|
| 3039 | * Filters the SELECT clause of the query. |
| 3040 | * |
| 3041 | * For use by caching plugins. |
| 3042 | * |
| 3043 | * @since 2.5.0 |
| 3044 | * |
| 3045 | * @param string $fields The SELECT clause of the query. |
| 3046 | * @param WP_Query $query The WP_Query instance (passed by reference). |
| 3047 | */ |
| 3048 | $fields = apply_filters_ref_array( 'posts_fields_request', array( $fields, &$this ) ); |
| 3049 | |
| 3050 | /** |
| 3051 | * Filters the LIMIT clause of the query. |
| 3052 | * |
| 3053 | * For use by caching plugins. |
| 3054 | * |
| 3055 | * @since 2.5.0 |
| 3056 | * |
| 3057 | * @param string $limits The LIMIT clause of the query. |