codility brackets opening and closing solution

codility you are given a string s consisting of n brackets opening problem solution.  

function isBalanced($str){
    $count = 0;
    $ocount = 0;
    $ccount = 0;
    $length = strlen($str);
    for($i = 0; $i < $length; $i++){
        if($str[$i] == '(')
            $ocount += 1;
        else if($str[$i] == ')')
            $ccount += 1;
       if($ccount == $ocount){
          $count = $ocount;
       }else{
            $count = $ccount;
       }
    }
    return $count;
}
echo isBalanced("))");