PHP realizes mutual conversion between binary, octal and hexadecimal

 /**
 *Add zeros in front of the missing digits when converting from decimal to binary, octal or hexadecimal*
 *
 * @param array $datalist Incoming data array(100,123,130)
 * @param int $bin The converted base can be: 2 ,8,16
 * @return array Return data array() Return the format without data conversion
 * @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; //Same base is ignored
 $bytelen=ceil(16/$bin); //Get one byte if it is $bin base The length of
 $aOutChar=array();
 foreach ($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 ; //If the length is less than one byte, automatically add 0
 }
 $aOutChar[]=$t;
 }
 return $aOutChar;
 }
 Test:
 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"
 }

Binary, Binary, octal, hexadecimal to decimal This conversion uses multiplication, such as: 1101 converted to decimal: 1*2^3+1*2^2+0*2^1+1*2^0

 /**
 *Binary, octal, hexadecimal to decimal*
 *
 * @param array $datalist Pass in data array(df,ef)
 * @param int $bin The converted base can be: 2, 8, 16
 * @return array Return data array() Return the format without data conversion
 * @copyright chengmo QQ:8292669
*/
 function bin_todec($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; //No conversion to decimal
 $aOutData=array(); //Define the output to save the array
 foreach ($datalist as $num)
 {
 $atnum=str_split($num); //Convert String split into single character array
 $atlen=count($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;
 }
 Test:
 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));

 [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)
 }


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