The function hex2bin does not exist in PHP5.
You can use 'pack' instead :
$binary_string = pack("H*" , $hex_string);
hex2bin
(PHP 5 >= 5.4.0, PHP 7, PHP 8)
hex2bin — 转换十六进制字符串为二进制字符串
参数
-
string -
十六进制表示的数据
返回值
返回给定数据的二进制表示 或者在失败时返回 false。
错误／异常
如果输入的十六进制字符串是奇数长数或者无效的十六进制字符串将会抛出
E_WARNING 级别的错误。
示例
示例 #1 hex2bin() 例子
<?php
$hex = hex2bin("6578616d706c65206865782064617461");
var_dump($hex);
?>以上示例的输出类似于：
string(16) "example hex data"
add a note
User Contributed Notes 13 notes
Anonymous ¶
13 years ago
nino at re-gister dot com ¶
3 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.
Anonymous ¶
12 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.
jannik [dot] zappe [at] udo [dot] edu ¶
11 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;
}
}
?>
stanliwise at gmail dot com ¶
2 years 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'));
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
carschrotter at gmail dot com ¶
11 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;
?>
Johnson ¶
11 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;
}
?>
iradu at unix-world dot org ¶
8 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) $out;
}
walf ¶
11 years ago
A drop-in hex2bin emulator which behaves just like the the one in v5.5.1.
<?php
if (!function_exists('hex2bin')) {
function hex2bin($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*', $data);
}
}
?>
jarismar dot php at gmail dot com ¶
11 years ago
A way to convert hex strings in the form "0x123ABC" to integer is to use the function base_convert("0x123ABC", 16, 10)
JLovrek ¶
6 years ago
replace
function Hex2Bin($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;
EM ¶
10 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.
