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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 |
|---|---|
| 3321 | * Filter the JOIN clause of the query. |
| 3322 | * |
| 3323 | * For use by caching plugins. |
| 3324 | * |
| 3325 | * @since 2.5.0 |
| 3326 | * |
| 3327 | * @param string $join The JOIN clause of the query. |
| 3328 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
| 3329 | */ |
| 3330 | $join = apply_filters_ref_array( 'posts_join_request', array( $join, &$this ) ); |
| 3331 | |
| 3332 | /** |
| 3333 | * Filter the ORDER BY clause of the query. |
| 3334 | * |
| 3335 | * For use by caching plugins. |
| 3336 | * |
| 3337 | * @since 2.5.0 |
| 3338 | * |
| 3339 | * @param string $orderby The ORDER BY clause of the query. |