An elegant byte-related conversion formula

Function analysis

/**
 * @desc Convert to bytes
 * Pay attention to the usage of case. Since break; is not written, an elegant conversion formula can be implemented
 * But if the order is changed, it will be over.
 * @author wangjiafang
 * @since 2010.12 .22
 * @param string
 * @return string
*/
function return_bytes($val) {
 $val = trim($val);
 $last = strtolower($val{strlen($val)-1});
 switch($last) {
 case 'g': $val *= 1024;
 case 'm': $val *= 1024;
 case 'k': $val *= 1024;
 }
 return $val;
 }