php公用函数：获取字符串中英文混合长度

//获取字符串中英文混合长度
function get_strlen($str, $charset = 'utf-8')
{
	if ($charset == 'utf-8') $str = iconv('utf-8', 'gb2312', $str);
	$num   = strlen($str);
	$cnNum = 0;
	for ($i = 0; $i  127) {
			$cnNum++;
			$i++;
		}
	}
	$enNum = $num - ($cnNum * 2);
	return $cnNum * 2 + $enNum;
}

Done !