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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 | 
|---|---|
| 402 |                          /* translators: %s: Name of the constant used. */ | 
| 403 |                          __( 'WordPress development updates are blocked by the %s constant.' ), | 
| 404 |                          '<code>WP_AUTO_UPDATE_CORE</code>' | 
| 405 |                     ), | 
| 406 |                     'severity'    => 'fail', | 
| 407 |                ); | 
| 408 |           } | 
| 409 |  | 
| 410 |           /** This filter is documented in wp-admin/includes/class-core-upgrader.php */ | 
| 411 |           if ( ! apply_filters( 'allow_dev_auto_core_updates', $wp_version ) ) { | 
| 412 |                return array( | 
| 413 |                     'description' => sprintf( | 
| 414 |                          /* translators: %s: Name of the filter used. */ | 
| 415 |                          __( 'WordPress development updates are blocked by the %s filter.' ), | 
| 416 |                          '<code>allow_dev_auto_core_updates</code>' | 
| 417 |                     ), | 
| 418 |                     'severity'    => 'fail', | 
| 419 |                ); | 
| 420 |           } |