src/Relay/Connection/ArrayConnection.php
public static function cursorToKey($cursor) {
      if ($decoded = base64_decode($cursor)) {
        return substr($decoded, strlen(self::PREFIX));
      }
      return null;
    }
public static function cursorToKey($cursor) {
      if ($decoded = base64_decode($cursor)) {
        return substr($decoded, strlen(self::PREFIX));
      }
      return null;
    }
Converts a cursor to its array key.

@param $cursor
@return null|string