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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 |
|---|---|
| 1382 | */ |
| 1383 | function wp_doing_cron() { |
| 1384 | /** |
| 1385 | * Filters whether the current request is a WordPress cron request. |
| 1386 | * |
| 1387 | * @since 4.8.0 |
| 1388 | * |
| 1389 | * @param bool $wp_doing_cron Whether the current request is a WordPress cron request. |
| 1390 | */ |
| 1391 | return apply_filters( 'wp_doing_cron', defined( 'DOING_CRON' ) && DOING_CRON ); |
| 1392 | } |
| 1393 | |
| 1394 | /** |
| 1395 | * Check whether variable is a WordPress Error. |
| 1396 | * |
| 1397 | * Returns true if $thing is an object of the WP_Error class. |
| 1398 | * |
| 1399 | * @since 2.1.0 |
| 1400 | * |