return $str;
}
+
+ static function constEq($s1, $s2)
+ {
+ if (strlen($s1) != strlen($s2)) {
+ return false;
+ }
+
+ $result = true;
+ $length = strlen($s1);
+ for ($i = 0; $i < $length; $i++) {
+ $result &= ($s1[$i] == $s2[$i]);
+ }
+ return $result;
+ }
}