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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 |
|---|---|
| 555 | |
| 556 | /** |
| 557 | * Filter the date query WHERE clause. |
| 558 | * |
| 559 | * @since 3.7.0 |
| 560 | * |
| 561 | * @param string $where WHERE clause of the date query. |
| 562 | * @param WP_Date_Query $this The WP_Date_Query instance. |
| 563 | */ |
| 564 | return apply_filters( 'get_date_sql', $where, $this ); |
| 565 | } |
| 566 | |
| 567 | /** |
| 568 | * Generate SQL clauses to be appended to a main query. |
| 569 | * |
| 570 | * Called by the public {@see WP_Date_Query::get_sql()}, this method |
| 571 | * is abstracted out to maintain parity with the other Query classes. |
| 572 | * |
| 573 | * @since 4.1.0 |