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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 |
|---|---|
| 3337 | * Filter the SELECT clause of the query. |
| 3338 | * |
| 3339 | * For use by caching plugins. |
| 3340 | * |
| 3341 | * @since 2.5.0 |
| 3342 | * |
| 3343 | * @param string $fields The SELECT clause of the query. |
| 3344 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
| 3345 | */ |
| 3346 | $fields = apply_filters_ref_array( 'posts_fields_request', array( $fields, &$this ) ); |
| 3347 | |
| 3348 | /** |
| 3349 | * Filter the LIMIT clause of the query. |
| 3350 | * |
| 3351 | * For use by caching plugins. |
| 3352 | * |
| 3353 | * @since 2.5.0 |
| 3354 | * |
| 3355 | * @param string $limits The LIMIT clause of the query. |