php 实现二进制、八进制、十六进制的互相转换

<?php
    /**
     *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/5.2.0
    Content-type: text/html

    array(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"
    }

<?php
    /**
     *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;
    }

    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/5.2.0
    Content-type: text/html

    array(3) {
      [0]=>
      int(255)
      [1]=>
      int(65331)
      [2]=>
      int(52275)
    }
    array(2) {
      [0]=>
      int(124)
      [1]=>
      int(508)
    }
    array(2) {
      [0]=>
      int(342099)
      [1]=>
      int(5345)
    }