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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 |
|---|---|
| 1566 | */ |
| 1567 | function wp_doing_cron() { |
| 1568 | /** |
| 1569 | * Filters whether the current request is a WordPress cron request. |
| 1570 | * |
| 1571 | * @since 4.8.0 |
| 1572 | * |
| 1573 | * @param bool $wp_doing_cron Whether the current request is a WordPress cron request. |
| 1574 | */ |
| 1575 | return apply_filters( 'wp_doing_cron', defined( 'DOING_CRON' ) && DOING_CRON ); |
| 1576 | } |
| 1577 | |
| 1578 | /** |
| 1579 | * Checks whether the given variable is a WordPress Error. |
| 1580 | * |
| 1581 | * Returns whether `$thing` is an instance of the `WP_Error` class. |
| 1582 | * |
| 1583 | * @since 2.1.0 |
| 1584 | * |