php - Hex2bin is not working when I am trying to use it to convert encoded data to binary -


i using bin2hex() function working when tried original value using hex2bin() saying "undefined function". solution?

hex2bin available php version >= 5.4.0 - php version 2 date?

below (copied php.net) solution if version can not updated:

<?php          function hextobin($hexstr)      {          $n = strlen($hexstr);          $sbin="";            $i=0;          while($i<$n)          {                    $a =substr($hexstr,$i,2);                        $c = pack("h*",$a);              if ($i==0){$sbin=$c;}              else {$sbin.=$c;}              $i+=2;          }          return $sbin;      }  ?>

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