/usr/share/php/PhpParser/Unserializer.php is in php-parser 1.0.1-1.
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 14 15 | <?php
namespace PhpParser;
interface Unserializer
{
    /**
     * Unserializes a string in some format into a node tree.
     *
     * @param string $string Serialized string
     *
     * @return array Statements
     */
    public function unserialize($string);
}
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