hex2bin

(PHP 5 >= 5.4.0, PHP 7, PHP 8)

hex2binConvertit une chaîne encodée en hexadécimal vers du binaire

Description

hex2bin(string $string): string|false

Convertit une chaîne binaire encodée en hexadécimal.

Attention

Cette fonction ne convertit PAS un nombre hexadécimal en un nombre binaire. Cela peut être réalisé en utilisant la fonction base_convert().

Liste de paramètres

string

Représentation hexadécimale de la donnée.

Valeurs de retour

Retourne la représentation binaire de la donnée ou false si une erreur survient.

Erreurs / Exceptions

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.

Exemples

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"

Voir aussi

  • bin2hex() - Convertit des données binaires en représentation hexadécimale
  • unpack() - Déconditionne des données depuis une chaîne binaire

add a note

User Contributed Notes 13 notes

up
39
Anonymous
12 years ago
The function hex2bin does not exist in PHP5.
You can use 'pack' instead :

$binary_string = pack("H*" , $hex_string);
up
6
nino at re-gister dot com
2 years ago
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.
up
5
jannik [dot] zappe [at] udo [dot] edu
10 years ago
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;
}
}
?>
up
3
Anonymous
11 years ago
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.
up
0
stanliwise at gmail dot com
1 year ago
#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'));
up
0
omer dot lakraa at hotmail dot fr
4 years ago
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
up
0
carschrotter at gmail dot com
10 years ago
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;
?>
up
-1
Johnson
10 years ago
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;
}
?>
up
-1
walf
10 years ago
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);
}
}
?>
up
-1
iradu at unix-world dot org
7 years ago
$test = bin2hex('sample ...');
echo _hex2bin($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;
}
up
-4
jarismar dot php at gmail dot com
10 years ago
A way to convert hex strings in the form "0x123ABC" to integer is to use the function base_convert("0x123ABC", 16, 10)
up
-3
JLovrek
6 years ago
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;
up
-25
EM
9 years ago
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.
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