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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 |
|---|---|
| 2993 | * Filter the JOIN clause of the query. |
| 2994 | * |
| 2995 | * Specifically for manipulating paging queries. |
| 2996 | * |
| 2997 | * @since 1.5.0 |
| 2998 | * |
| 2999 | * @param string $join The JOIN clause of the query. |
| 3000 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
| 3001 | */ |
| 3002 | $join = apply_filters_ref_array( 'posts_join_paged', array( $join, &$this ) ); |
| 3003 | |
| 3004 | /** |
| 3005 | * Filter the ORDER BY clause of the query. |
| 3006 | * |
| 3007 | * @since 1.5.1 |
| 3008 | * |
| 3009 | * @param string $orderby The ORDER BY clause of the query. |
| 3010 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
| 3011 | */ |