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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 |
|---|---|
| 4019 | |
| 4020 | /** |
| 4021 | * Test if the supplied date is valid for the Gregorian calendar |
| 4022 | * |
| 4023 | * @since 3.5.0 |
| 4024 | * |
| 4025 | * @return bool true|false |
| 4026 | */ |
| 4027 | function wp_checkdate( $month, $day, $year, $source_date ) { |
| 4028 | return apply_filters( 'wp_checkdate', checkdate( $month, $day, $year ), $source_date ); |
| 4029 | } |
| 4030 | |
| 4031 | /** |
| 4032 | * Load the auth check for monitoring whether the user is still logged in. |
| 4033 | * |
| 4034 | * Can be disabled with remove_action( 'admin_enqueue_scripts', 'wp_auth_check_load' ); |
| 4035 | * |
| 4036 | * This is disabled for certain screens where a login screen could cause an |
| 4037 | * inconvenient interruption. A filter called wp_auth_check_load can be used |