php 实现二进制、八进制、十六进制的互相转换

/***十进制转二进制、八进制、十六进制 不足位数前面补零*** @param array $datalist 传入数据array(100,123,130)* @param int $bin 转换的进制可以是：2,8,16* @return array 返回数据 array() 返回没有数据转换的格式* @author chengmo qq:8292669* @copyright http://www.cnblogs.com/chengmo*/function decto_bin($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);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$aoutchar=array();foreach ($datalist as $num){$t="";$num=intval($num);if($num===0)continue;while($num>0){$t=$arr[$num%$bin].$t;$num=floor($num/$bin);}$tlen=strlen($t);if($tlen%$bytelen!=0){$pad_len=$bytelen-$tlen%$bytelen;$t=str_pad("",$pad_len,"0",str_pad_left).$t; //不足一个字节长度，自动前面补充0}$aoutchar[]=$t;}return $aoutchar;}测试：var_dump(decto_bin(array(128,253),2));var_dump(decto_bin(array(128,253),8));var_dump(decto_bin(array(128,253),16));X-Powered-By: PHP/5.2.0Content-type: text/htmlarray(2) {[0]=>string(8) "10000000"[1]=>string(8) "11111101"}array(2) {[0]=>string(4) "0200"[1]=>string(4) "0375"}array(2) {[0]=>string(2) "80"[1]=>string(2) "FD"}复制代码二、二进制、八进制、十六进制转十进制这个转换用乘法，如：1101 转十进制：1*2^3+1*2^2+0*2^1+1*2^0/***二进制、八进制、十六进制 转十进制*** @param array $datalist 传入数据array(df,ef)* @param int $bin 转换的进制可以是：2,8,16* @return array 返回数据 array() 返回没有数据转换的格式* @copyright chengmo QQ:8292669*/function bin_todec($datalist,$bin){static $arr=array('0'=>0,'1'=>1,'2'=>2,'3'=>3,'4'=>4,'5'=>5,'6'=>6,'7'=>7,'8'=>8,'9'=>9,'A'=>10,'B'=>11,'C'=>12,'D'=>13,'E'=>14,'F'=>15);if(!is_array($datalist))$datalist=array($datalist);if($bin==10)return $datalist; //为10进制不转换$aOutData=array(); //定义输出保存数组foreach ($datalist as $num){$atnum=str_split($num); //将字符串分割为单个字符数组$atlen=count($atnum);$total=0;$i=1;foreach ($atnum as $tv){$tv=strtoupper($tv);if(array_key_exists($tv,$arr)){if($arr[$tv]==0)continue;$total=$total+$arr[$tv]*pow($bin,$atlen-$i);}$i++;}$aOutData[]=$total;}return $aOutData;}立即学习“PHP免费学习笔记（深入）”；测试：var_dump(bin_todec(array('ff','ff33','cc33'),16));var_dump(bin_todec(array('1101101','111101101'),2));var_dump(bin_todec(array('1234123','12341'),8));X-Powered-By: PHP/5.2.0Content-type: text/htmlarray(3) {[0]=>int(255)[1]=>int(65331)[2]=>int(52275)}array(2) {[0]=>int(124124)[1]=>int(508)}array(2) {[0]=>int(342099)[1]=>int(5345)}复制代码php其实内置不少函数可以完成这些内容：bindec()，decoct()，dechex() base_convert() decbin() 这里只是实现思路。