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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 |
|---|---|
| 535 | |
| 536 | /** |
| 537 | * Filter the date query WHERE clause. |
| 538 | * |
| 539 | * @since 3.7.0 |
| 540 | * |
| 541 | * @param string $where WHERE clause of the date query. |
| 542 | * @param WP_Date_Query $this The WP_Date_Query instance. |
| 543 | */ |
| 544 | return apply_filters( 'get_date_sql', $where, $this ); |
| 545 | } |
| 546 | |
| 547 | /** |
| 548 | * Generate SQL clauses to be appended to a main query. |
| 549 | * |
| 550 | * Called by the public {@see WP_Date_Query::get_sql()}, this method |
| 551 | * is abstracted out to maintain parity with the other Query classes. |
| 552 | * |
| 553 | * @since 4.1.0 |