/usr/share/php/PhpParser/ErrorHandler.php is in php-parser 3.1.4-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13  | <?php
namespace PhpParser;
interface ErrorHandler
{
    /**
     * Handle an error generated during lexing, parsing or some other operation.
     *
     * @param Error $error The error that needs to be handled
     */
    public function handleError(Error $error);
}
 |