/** * 10进制转为62进制 *  * @param integer $n 10进制数值 * @return string 62进制 */function dec62($n) {	$base = 62;	$index = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';	$ret = '';	for($t = floor(log10($n) / log10($base)); $t >= 0; $t --) {		$a = floor($n / pow($base, $t));		$ret .= substr($index, $a, 1);		$n -= $a * pow($base, $t);	}	return $ret;}

 

/** * 62进制转为10进制 * * @param integer $n 62进制 * @return string 10进制 */function dec10($s) {	$base = 62;	$index = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';	$ret = 0;	$len = strlen($s) - 1;	for($t = 0; $t <= $len; $t ++) {		$ret += strpos($index, substr($s, $t, 1)) * pow($base, $len - $t);	}	return $ret;}