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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 |
|---|---|
| 1138 | // ms_protect_special_option( $option ); @todo |
| 1139 | |
| 1140 | /** |
| 1141 | * Fires immediately before a specific site option is deleted. |
| 1142 | * |
| 1143 | * The dynamic portion of the hook name, `$option`, refers to the option name. |
| 1144 | * |
| 1145 | * @since 3.0.0 |
| 1146 | */ |
| 1147 | do_action( 'pre_delete_site_option_' . $option ); |
| 1148 | |
| 1149 | if ( !is_multisite() ) { |
| 1150 | $result = delete_option( $option ); |
| 1151 | } else { |
| 1152 | $row = $wpdb->get_row( $wpdb->prepare( "SELECT meta_id FROM {$wpdb->sitemeta} WHERE meta_key = %s AND site_id = %d", $option, $wpdb->siteid ) ); |
| 1153 | if ( is_null( $row ) || !$row->meta_id ) |
| 1154 | return false; |
| 1155 | $cache_key = "{$wpdb->siteid}:$option"; |
| 1156 | wp_cache_delete( $cache_key, 'site-options' ); |