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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 |
|---|---|
| 1321 | * Fires immediately before a specific network option is deleted. |
| 1322 | * |
| 1323 | * The dynamic portion of the hook name, `$option`, refers to the option name. |
| 1324 | * |
| 1325 | * @since 3.0.0 |
| 1326 | * @since 4.4.0 The `$option` parameter was added |
| 1327 | * |
| 1328 | * @param string $option Option name. |
| 1329 | */ |
| 1330 | do_action( 'pre_delete_site_option_' . $option, $option ); |
| 1331 | |
| 1332 | if ( ! is_multisite() ) { |
| 1333 | $result = delete_option( $option ); |
| 1334 | } else { |
| 1335 | $row = $wpdb->get_row( $wpdb->prepare( "SELECT meta_id FROM {$wpdb->sitemeta} WHERE meta_key = %s AND site_id = %d", $option, $network_id ) ); |
| 1336 | if ( is_null( $row ) || ! $row->meta_id ) { |
| 1337 | return false; |
| 1338 | } |
| 1339 | $cache_key = "$network_id:$option"; |