Ticket #51699: 51699-1.patch

option.php

@@ -178 +178 @@
         return apply_filters( "option_{$option}", maybe_unserialize( $value ), $option );
 }
 
+
 /**
+ * Retrieves boolean to check if option exists or not.
+ *
+ * This is preferred method rather than using `if (!get_options("xyz"))` because this 
+ * will be misleading if option has legitimate value of `0/false/null/empty-string`. 
+ *
+ *
+ * @since 5.5.3
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param string $option_name  Name of the option to retrieve. Expected to not be SQL-escaped.
+ * @param mixed  $site_wide Optional. If user checks for current site or network option.
+ */
+function option_exists( $option_name, $site_wide = false ) {
+        global $wpdb; 
+        return $wpdb->query( $wpdb->prepare( "SELECT * FROM ". ($site_wide ? $wpdb->base_prefix : $wpdb->prefix). "options WHERE option_name ='%s' LIMIT 1", $option_name ) );
+}
+ 
+ 
+/**
  * Protects WordPress special option from being modified.
  *
  * Will die if $option is in protected list. Protected options are 'alloptions'