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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 |
|---|---|
| 9 | if ( validate_file($plugin) ) |
| 10 | wp_die(__('Invalid plugin.')); |
| 11 | if ( ! file_exists(ABSPATH . PLUGINDIR . '/' . $plugin) ) |
| 12 | wp_die(__('Plugin file does not exist.')); |
| 13 | if (!in_array($plugin, $current)) { |
| 14 | $current[] = $plugin; |
| 15 | sort($current); |
| 16 | update_option('active_plugins', $current); |
| 17 | include(ABSPATH . PLUGINDIR . '/' . $plugin); |
| 18 | do_action('activate_' . $plugin); |
| 19 | } |
| 20 | wp_redirect('plugins.php?activate=true'); |
| 21 | } else if ('deactivate' == $_GET['action']) { |
| 22 | check_admin_referer('deactivate-plugin_' . $_GET['plugin']); |
| 23 | $current = get_option('active_plugins'); |
| 24 | array_splice($current, array_search( $_GET['plugin'], $current), 1 ); // Array-fu! |
| 25 | update_option('active_plugins', $current); |
| 26 | do_action('deactivate_' . trim( $_GET['plugin'] )); |
| 27 | wp_redirect('plugins.php?deactivate=true'); |