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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 |
|---|---|
| 1501 | */ |
| 1502 | function wp_doing_cron() { |
| 1503 | /** |
| 1504 | * Filters whether the current request is a WordPress cron request. |
| 1505 | * |
| 1506 | * @since 4.8.0 |
| 1507 | * |
| 1508 | * @param bool $wp_doing_cron Whether the current request is a WordPress cron request. |
| 1509 | */ |
| 1510 | return apply_filters( 'wp_doing_cron', defined( 'DOING_CRON' ) && DOING_CRON ); |
| 1511 | } |
| 1512 | |
| 1513 | /** |
| 1514 | * Checks whether the given variable is a WordPress Error. |
| 1515 | * |
| 1516 | * Returns whether `$thing` is an instance of the `WP_Error` class. |
| 1517 | * |
| 1518 | * @since 2.1.0 |
| 1519 | * |