PHP realizes hexadecimal conversion (binary, octal, hexadecimal) and mutual conversion code_PHP tutorial

Convert decimal to binary, octal, hexadecimal
To convert from decimal to other bases, just use the number to divide it by the base number to be converted and read the remainder. Just connect them together.

Copy code The code is as follows:

/**
*Add zeros in front of the missing digits when converting from decimal to binary, octal or hexadecimal*
*
* @param array $datalist Pass in data array(100,123,130)
* @param int $bin The converted base can be: 2, 8, 16
* @return array Return data array() Return the format without data conversion
* @copyright chengmo QQ:8292669
*/
function decto_bin($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 the length of one byte if it is $bin base
$aOutChar=array();
foreach ($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, 0 will be automatically added in front
}
$aOutChar[]=$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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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, octal, hexadecimal to decimal
This conversion uses multiplication, such as: 1101 to decimal: 1*2^3+1*2^2+0*2^1+1*2^0
Code:

Copy code The code is as follows:

/**
*Binary, octal, hexadecimal to decimal*
*
* @param array $datalist Incoming data array(df,ef)
* @param int $bin Conversion base Can be: 2, 8, 16
* @return array Return data array() Return format without data conversion
* @copyright chengmo QQ:8292669
*/
function bin_todec($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
$aOutData=array(); //Define the output storage array
foreach ($datalist as $num)
{
$atnum=str_split($num); //Split the string 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));

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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)
}
Later, these are just implementation methods. In fact, it doesn’t matter whether it is PHP language or other, the implementation ideas are the same. PHP actually has many built-in functions to complete these contents:
bindec(), decoct(), dechex() base_convert() decbin() This is just an implementation idea. hehe!

http://www.bkjia.com/PHPjc/322507.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/322507.htmlTechArticleConvert decimal to binary, octal, and hexadecimal to convert from decimal to other bases. Use whatever you use. The number is continuously divided by the base number to be converted and the remainder is read. Just connect them together...