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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 |
|---|---|
| 1219 | */ |
| 1220 | function wp_doing_cron() { |
| 1221 | /** |
| 1222 | * Filters whether the current request is a WordPress cron request. |
| 1223 | * |
| 1224 | * @since 4.8.0 |
| 1225 | * |
| 1226 | * @param bool $wp_doing_cron Whether the current request is a WordPress cron request. |
| 1227 | */ |
| 1228 | return apply_filters( 'wp_doing_cron', defined( 'DOING_CRON' ) && DOING_CRON ); |
| 1229 | } |
| 1230 | |
| 1231 | /** |
| 1232 | * Check whether variable is a WordPress Error. |
| 1233 | * |
| 1234 | * Returns true if $thing is an object of the WP_Error class. |
| 1235 | * |
| 1236 | * @since 2.1.0 |
| 1237 | * |