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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 |
|---|---|
| 1751 | */ |
| 1752 | function wp_doing_cron() { |
| 1753 | /** |
| 1754 | * Filters whether the current request is a WordPress cron request. |
| 1755 | * |
| 1756 | * @since 4.8.0 |
| 1757 | * |
| 1758 | * @param bool $wp_doing_cron Whether the current request is a WordPress cron request. |
| 1759 | */ |
| 1760 | return apply_filters( 'wp_doing_cron', defined( 'DOING_CRON' ) && DOING_CRON ); |
| 1761 | } |
| 1762 | |
| 1763 | /** |
| 1764 | * Checks whether the given variable is a WordPress Error. |
| 1765 | * |
| 1766 | * Returns whether `$thing` is an instance of the `WP_Error` class. |
| 1767 | * |
| 1768 | * @since 2.1.0 |
| 1769 | * |