php 实现进制相互转换

朱雀 2023-10-17 15:51 106阅读 0赞

<?php  
//echo decbin(12);  
/\*function getval($n) \{  
$str = 0;  
while($n!=0) \{  
//var\_dump('000');  
//exit;  
if($n%2!=1) \{  
echo '999';  
echo $str;  
$str.=$n%2;  
\}  
if($n%2==1)  
\{  
echo '777';  
echo $str;  
$str.=$n%2;  
\}  
return $str;  
\}//while end  
//return $str;  
\}  
$n = 13;  
echo getval($n);  
\*/  
function decto\_bin($datalist,$bin)  
\{  
static $arr=array(0,1,2,3,4,5,6,7,8,9,'A','B','C','D','E','F');  
if(!is\_array($datalist)) $datalist=array($datalist);  
//var\_dump($datalist); //array(1) \{ \[0\]=> int(12) \}  
if($bin==10) return $datalist; //相同进制忽略  
$bytelen=ceil(16/$bin); //获得如果是$bin进制，一个字节的长度  
//var\_dump($bytelen); //float(8)  
$aOutChar=array();  
foreach ($datalist as $num)  
\{  
$t="";  
$num=intval($num);  
//var\_dump($num); //int(12)  
if($num===0) continue;  
while($num>0)  
\{  
//var\_dump($num); //int(12) float(6) float(3) float(1)  
//var\_dump($bin); //int(2) int(2) int(2) int(2)  
//var\_dump($num%$bin); //int(0) int(0) int(1) int(1)  
//var\_dump($arr\[$num%$bin\]); //int(0) int(0) int(1) int(1)  
$t=$arr\[$num%$bin\].$t;  
//var\_dump($t); //string(1) "0" string(2) "00" string(3) "100" string(4) "1100"  
$num=floor($num/$bin);  
//var\_dump($num); //float(6) float(3) float(1) float(0)  
\}  
//var\_dump($t); //string(4) "1100"  
$tlen=strlen($t);  
//var\_dump($tlen); //int(4)  
//var\_dump($tlen%$bytelen); //int(4)  
if($tlen%$bytelen!=0)  
\{  
$pad\_len=$bytelen-$tlen%$bytelen;  
//var\_dump($pad\_len); //float(4)  
$t=str\_pad("",$pad\_len,"0",STR\_PAD\_LEFT).$t; //不足一个字节长度，自动前面补充0  
\}  
//var\_dump($t); //string(8) "00001100"  
$aOutChar\[\]=$t;  
\}//foreach end  
return $aOutChar;  
\}  
//var\_dump(decto\_bin(array(12),2)); //array(1) \{ \[0\]=> string(8) "00001100" \}  
//var\_dump(decto\_bin(array(12),10)); //array(1) \{ \[0\]=> int(12) \}  
var\_dump(decto\_bin(array(12),2));  
//var\_dump(decto\_bin(array(128,253),8));  
//var\_dump(decto\_bin(array(128,253),16));  
?>