PHP realizes mutual conversion between binary, octal and hexadecimal-PHP Tutorial-php.cn

/**
*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));
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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"
}

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Binary,Binary, octal, hexadecimal to decimalThis 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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php actually has many built-in functions to complete these contents: bindec(), decoct(), dechex() base_convert() decbin() This is just an implementation idea.