The function hex2bin does not exist in PHP5.
You can use 'pack' instead :
$binary_string = pack("H*" , $hex_string);
(PHP 5 >= 5.4.0, PHP 7, PHP 8)
hex2bin — Convertit une chaîne encodée en hexadécimal vers du binaire
Convertit une chaîne binaire encodée en hexadécimal.
Cette fonction ne convertit PAS un nombre hexadécimal en un nombre binaire. Cela peut être réalisé en utilisant la fonction base_convert().
string
Représentation hexadécimale de la donnée.
Retourne la représentation binaire de la donnée ou false
si une erreur survient.
Si la chaîne d'entrée en héxadécimale est d'une longueur impaire ou
si la chaîne en héxadécimale est invalide, une alerte de niveau
E_WARNING
sera émise.
Exemple #1 Exemple avec hex2bin()
<?php
$hex = hex2bin("6578616d706c65206865782064617461");
var_dump($hex);
?>
Résultat de l'exemple ci-dessus est similaire à :
string(16) "example hex data"
The function hex2bin does not exist in PHP5.
You can use 'pack' instead :
$binary_string = pack("H*" , $hex_string);
if you want to convert a hex encoded string to a binary string without any notices/errors regardless of the input, use this function:
<?php
function hex2binary($str)
{
return ctype_xdigit(strlen($str) % 2 ? "" : $str) ? hex2bin($str) : false;
}
hex2binary(""); // false
hex2binary("a"); // false
hex2binary("ab"); // binary-string
?>
if the return type is string, you have your binary-string. otherwise (bool) false.
The function pack("H*" , $hex_string); will not work as expected if $hex_string contains an odd number of hexadecimal digits.
For example:
<?php echo ord(pack("H*", 'F')); ?>
will return 240 not 15. Use pack("H*", '0F'); instead.
I modified the function by Johnson a bit so it can be used as a drop-in-replacement. You don't need to worry about upgrading php because when it is upgraded, it will use the build in function.
<?php
if ( !function_exists( 'hex2bin' ) ) {
function hex2bin( $str ) {
$sbin = "";
$len = strlen( $str );
for ( $i = 0; $i < $len; $i += 2 ) {
$sbin .= pack( "H*", substr( $str, $i, 2 ) );
}
return $sbin;
}
}
?>
#error:
hex2bin(): Hexadecimal input string must have an even length
For those who are facing the error above trying to convert hex to bin. you can pad your hex string with initial 0 before hex2bin.
function hexPad(string $hex_string)
{
$st_l = strlen($hex_string);
return str_pad($hex_string, $st_l + ($st_l % 2), '0', STR_PAD_LEFT);
}
hexPad('1bc') -> '01bc';
for usage hex2bin(hexPad('1bc'));
If you want to convert hex to GUID format (In my case, it was to convert GUID from MSSQL database) :
<?php
function hex2Guid($hex)
{
$hex = [
substr($hex, 0, 8),
substr($hex, 8, 4),
substr($hex, 12, 4),
substr($hex, 16, 4),
substr($hex, 20),
];
$order[0] = [6, 7, 4, 5, 2, 3, 0, 1];
$order[1] = [2, 3, 0, 1];
$order[2] = [2, 3, 0, 1];
$order[3] = [0, 1, 2, 3];
$order[4] = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11];
$result = "";
for($num = 0; $num < count($order); $num++)
{
for($i = 0; $i < count($order[$num]); $i++)
{
$result .= $hex[$num][$order[$num][$i]];
}
if($num != count($order) -1)
{
$result .= "-";
}
}
return strtoupper($result);
}
Example :
echo hex2Guid("64d3938b7008cd4bad5ffe56755d163f");
// return 8B93D364-0870-4BCD-AD5F-FE56755D163F
Case of an incomplete hex string following function may help:
<?php
function make2validhex($data){
$data = (string) $data;
$len = strlen($data);
if($len % 2) {
return substr($data, 0, $len -1);
}
return $data;
}
?>
test:
<?php
$string="not complete";
echo $string;
echo PHP_EOL;
$hex = bin2hex($string); //"6e6f7420636f6d706c657465"
echo $hex;
echo PHP_EOL;
$deff = substr ($hex, 0, strlen($hex) -1);//"6e6f7420636f6d706c65746"
echo $deff;
echo PHP_EOL;
echo hex2bin(make2validhex($deff)); //"not complet"
echo PHP_EOL;
?>
For those who have php version prior to 5.4, i have a solution to convert hex to binary. It works for me in an encryption and decryption application.
<?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;
}
?>
$test = bin2hex('sample ...');
echo _hex2bin($test);
// another hex2bin replacement
function _hex2bin($result) {
$out = '';
for($c=0;$c<strlen($result);$c+=2) {
$out .= chr(hexdec($result[$c].$result[$c+1]));
} //end for
return (string) $out;
}
A drop-in hex2bin emulator which behaves just like the the one in v5.5.1.
<?php
if (!function_exists('hex2bin')) {
function hex2bin($data) {
static $old;
if ($old === null) {
$old = version_compare(PHP_VERSION, '5.2', '<');
}
$isobj = false;
if (is_scalar($data) || (($isobj = is_object($data)) && method_exists($data, '__toString'))) {
if ($isobj && $old) {
ob_start();
echo $data;
$data = ob_get_clean();
}
else {
$data = (string) $data;
}
}
else {
trigger_error(__FUNCTION__.'() expects parameter 1 to be string, ' . gettype($data) . ' given', E_USER_WARNING);
return;//null in this case
}
$len = strlen($data);
if ($len % 2) {
trigger_error(__FUNCTION__.'(): Hexadecimal input string must have an even length', E_USER_WARNING);
return false;
}
if (strspn($data, '0123456789abcdefABCDEF') != $len) {
trigger_error(__FUNCTION__.'(): Input string must be hexadecimal string', E_USER_WARNING);
return false;
}
return pack('H*', $data);
}
}
?>
A way to convert hex strings in the form "0x123ABC" to integer is to use the function base_convert("0x123ABC", 16, 10)
replace
function Hex2Bin($data) {
$BinData = "";
for ($i=0;$i<strlen($data);$i+=2)
$BinData .= chr( HexDec( substr($data,$i,2) ) );
return $BinData;
With
function hextobin($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;
Ran into an interesting case with hex2bin and php5.5.12 while upgrading from 5.3.3 -> 5.5.12
The previous code had redeclared the hex2bin function with the $binary_string = pack("H*" , $hex_string) trick.
php5.5.12 would have none of that. The solution, albeit a hacky one, was doing a find an replace of hex2bin to 'hex3bin' for the whole site directory.