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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 | 
|---|---|
| 113 |                               } | 
| 114 |                          } | 
| 115 |                     } | 
| 116 |  | 
| 117 |                     if ( ! in_array( $doaction, array( 'delete', 'spam', 'notspam' ), true ) ) { | 
| 118 |                          $sendback = wp_get_referer(); | 
| 119 |                          $user_ids = (array) $_POST['allusers']; | 
| 120 |  | 
| 121 |                          /** This action is documented in wp-admin/network/site-themes.php */ | 
| 122 |                          $sendback = apply_filters( 'handle_network_bulk_actions-' . get_current_screen()->id, $sendback, $doaction, $user_ids ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores | 
| 123 |  | 
| 124 |                          wp_safe_redirect( $sendback ); | 
| 125 |                          exit; | 
| 126 |                     } | 
| 127 |  | 
| 128 |                     wp_safe_redirect( | 
| 129 |                          add_query_arg( | 
| 130 |                               array( | 
| 131 |                                    'updated' => 'true', |