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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 |
---|---|
4245 | function wp_checkdate( $month, $day, $year, $source_date ) { |
4246 | /** |
4247 | * Filter whether the given date is valid for the Gregorian calendar. |
4248 | * |
4249 | * @since 3.5.0 |
4250 | * |
4251 | * @param bool $checkdate Whether the given date is valid. |
4252 | * @param string $source_date Date to check. |
4253 | */ |
4254 | return apply_filters( 'wp_checkdate', checkdate( $month, $day, $year ), $source_date ); |
4255 | } |
4256 |
|
4257 | /** |
4258 | * Load the auth check for monitoring whether the user is still logged in. |
4259 | * |
4260 | * Can be disabled with remove_action( 'admin_enqueue_scripts', 'wp_auth_check_load' ); |
4261 | * |
4262 | * This is disabled for certain screens where a login screen could cause an |
4263 | * inconvenient interruption. A filter called wp_auth_check_load can be used |