time to decimal function

time_to_decimal.php

protected function _timeToDecimal($time){
        
        list($hours,$minutes) = array_pad(explode(':',$time, 2), 2, null);
        if(is_null($minutes)) $minutes = '00';
        
        if(strstr($hours, '-')){
            $negative=true;
            $hours = 0 - $hours;
        }else{
            $negative= false;
        }
        $h = $hours;
        $min = number_format($minutes) / 60;
        $result = number_format($h + $min,3);
        if($negative === true)$result = -1 * abs($result);
        return $result;
    }