PHPUnit_Util_XML::prepareString PHP Méthode

    public static function prepareString($string)
    {
        return preg_replace('([\\x00-\\x04\\x0b\\x0c\\x0e-\\x1f\\x7f])e', 'sprintf( "&#x%02x;", ord( "\\1" ) )', htmlspecialchars(self::convertToUtf8($string), ENT_COMPAT, 'UTF-8'));
    }

 /**
  * @dataProvider charProvider
  */
 public function testPrepareString($char)
 {
     $e = null;
     $escapedString = PHPUnit_Util_XML::prepareString($char);
     $xml = "<?xml version='1.0' encoding='UTF-8' ?><tag>{$escapedString}</tag>";
     $dom = new DomDocument('1.0', 'UTF-8');
     try {
         $dom->loadXML($xml);
     } catch (Exception $e) {
     }
     $this->assertNull($e, sprintf('PHPUnit_Util_XML::prepareString("\\x%02x") should not crash DomDocument', ord($char)));
 }