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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 |
|---|---|
| 4574 | function wp_checkdate( $month, $day, $year, $source_date ) { |
| 4575 | /** |
| 4576 | * Filter whether the given date is valid for the Gregorian calendar. |
| 4577 | * |
| 4578 | * @since 3.5.0 |
| 4579 | * |
| 4580 | * @param bool $checkdate Whether the given date is valid. |
| 4581 | * @param string $source_date Date to check. |
| 4582 | */ |
| 4583 | return apply_filters( 'wp_checkdate', checkdate( $month, $day, $year ), $source_date ); |
| 4584 | } |
| 4585 | |
| 4586 | /** |
| 4587 | * Load the auth check for monitoring whether the user is still logged in. |
| 4588 | * |
| 4589 | * Can be disabled with remove_action( 'admin_enqueue_scripts', 'wp_auth_check_load' ); |
| 4590 | * |
| 4591 | * This is disabled for certain screens where a login screen could cause an |
| 4592 | * inconvenient interruption. A filter called wp_auth_check_load can be used |