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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 |
|---|---|
| 722 | * Filter the table alias identified as compatible with the current clause. |
| 723 | * |
| 724 | * @since 4.1.0 |
| 725 | * |
| 726 | * @param string|bool $alias Table alias, or false if none was found. |
| 727 | * @param array $clause First-order query clause. |
| 728 | * @param array $parent_query Parent of $clause. |
| 729 | * @param object $this WP_Meta_Query object. |
| 730 | */ |
| 731 | return apply_filters( 'meta_query_find_compatible_table_alias', $alias, $clause, $parent_query, $this ) ; |
| 732 | } |
| 733 | |
| 734 | /** |
| 735 | * Checks whether the current query has any OR relations. |
| 736 | * |
| 737 | * In some cases, the presence of an OR relation somewhere in the query will require |
| 738 | * the use of a `DISTINCT` or `GROUP BY` keyword in the `SELECT` clause. The current |
| 739 | * method can be used in these cases to determine whether such a clause is necessary. |
| 740 | * |