Php hex string to byte

miguelmota / util.php

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function string2ByteArray ( $ string )

return unpack( ‘C*’ , $ string );

>

function byteArray2String ( $ byteArray )

$ chars = array_map(» chr «, $ byteArray );

return join( $ chars );

>

function byteArray2Hex ( $ byteArray )

$ chars = array_map(» chr «, $ byteArray );

$ bin = join( $ chars );

return bin2hex( $ bin );

>

function hex2ByteArray ( $ hexString )

$ string = hex2bin( $ hexString );

return unpack( ‘C*’ , $ string );

>

function string2Hex ( $ string )

return bin2hex( $ string );

>

function hex2String ( $ hexString )

return hex2bin( $ hexString );

>

?>

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include ( ‘./util.php’ );

$ byteArray = unpack( ‘C*’ , ‘hello’ );

assert(string2ByteArray( ‘hello’ ) == $ byteArray );

assert(byteArray2String( $ byteArray ) == ‘hello’ );

assert(byteArray2Hex( $ byteArray ) == ‘68656c6c6f’ );

assert(hex2ByteArray( ‘68656c6c6f’ ) == $ byteArray );

assert(string2Hex( ‘hello’ ) == ‘68656c6c6f’ );

assert(hex2String( ‘68656c6c6f’ ) == ‘hello’ );

?>

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hex2bin

This function does NOT convert a hexadecimal number to a binary number. This can be done using the base_convert() function.

Parameters

Hexadecimal representation of data.

Return Values

Returns the binary representation of the given data or false on failure.

Errors/Exceptions

If the hexadecimal input string is of odd length or invalid hexadecimal string an E_WARNING level error is thrown.

Examples

Example #1 hex2bin() example

The above example will output something similar to:

string(16) "example hex data"

See Also

• bin2hex() — Convert binary data into hexadecimal representation
• unpack() — Unpack data from binary string

User Contributed Notes 13 notes

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:

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.

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.

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 ) );
>

The function pack(«H*» , $hex_string); will not work as expected if $hex_string contains an odd number of hexadecimal digits.

#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);
>

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) :

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 ];

return strtoupper ( $result );
>

Example :
echo hex2Guid ( «64d3938b7008cd4bad5ffe56755d163f» );

Case of an incomplete hex string following function may help:
function make2validhex ( $data ) $data = (string) $data ;
$len = strlen ( $data );
if( $len % 2 ) return substr ( $data , 0 , $len — 1 );
>
return $data ;
>
?>
test:
$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.

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 ;
>
?>

A drop-in hex2bin emulator which behaves just like the the one in v5.5.1.

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 );
>
>
?>

$test = bin2hex(‘sample . ‘);
echo _hex2bin($test);

// another hex2bin replacement
function _hex2bin($result) $out = »;
for($c=0;$c > //end for
return (string) $out;
>

A way to convert hex strings in the form «0x123ABC» to integer is to use the function base_convert(«0x123ABC», 16, 10)

function Hex2Bin($data) $BinData = «»;
for ($i=0;$i $BinData .= chr( HexDec( substr($data,$i,2) ) );
return $BinData;

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Idiom #176 Hex string to byte array

From hex string s of 2n digits, build the equivalent array a of n bytes.
Each pair of hexadecimal characters (16 possible values per digit) is decoded into one byte (256 possible values).

$a = array_map('hexdec', str_split($s, 2));

const char* hexstring = "deadbeef"; size_t length = sizeof(hexstring); unsigned char bytearray[length / 2]; for (size_t i = 0, j = 0; i < (length / 2); i++, j += 2) bytearray[i] = (hexstring[j] % 32 + 9) % 25 * 16 + (hexstring[j+1] % 32 + 9) % 25; 

byte[] a = new byte[s.Length/2]; for (int i = 0, h = 0; h

import std.algorithms; import std.array; import std.conv; import std.range;

ubyte[] a = s.chunks(2) .map!(digits => digits.to!ubyte) .array; 

import std.conv; import std.string;

ubyte[] a = cast(ubyte[]) hexString!s.representation;

import 'package:convert/convert.dart';

 use iso_c_binding, only : c_int8_t

 integer(kind=c_int8_t), dimension(:), allocatable :: a allocate (a(len(s)/2)) read(unit=s,fmt='(*(Z2))') a 

a, err := hex.DecodeString(s) if err != nil

s .split('') .map((el, ix, arr) => ix % 2 ? null : el + arr[ix + 1]) .filter(el => el !== null) .map(x => parseInt(x, 16))

import java.math.BigInteger;

byte[] a = new BigInteger(s, 16).toByteArray();

public static byte[] hexToByteArray(String s) < int len = s.length(); byte[] data = new byte[len / 2]; for (int i = 0; i < len; i += 2) < data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) return data; >

for i := 0 to length(s) div 2 - 1 do a[i] := StrToInt('$'+Copy(s,2*(i)+1,2));

let a: Vec = Vec::from_hex(s).expect("Invalid Hex String");

let a: Vec = decode(s).expect("Hex string should be valid");

use data_encoding::HEXLOWER_PERMISSIVE;

let a: Vec = HEXLOWER_PERMISSIVE.decode(&s.into_bytes()).unwrap();

Please choose a nickname before doing this

$a = array_map('hexdec', str_split($s, 2));

const char* hexstring = "deadbeef"; size_t length = sizeof(hexstring); unsigned char bytearray[length / 2]; for (size_t i = 0, j = 0; i < (length / 2); i++, j += 2) bytearray[i] = (hexstring[j] % 32 + 9) % 25 * 16 + (hexstring[j+1] % 32 + 9) % 25;

byte[] a = new byte[s.Length/2]; for (int i = 0, h = 0; h

ubyte[] a = s.chunks(2) .map!(digits => digits.to!ubyte) .array;

ubyte[] a = cast(ubyte[]) hexString!s.representation;

integer(kind=c_int8_t), dimension(:), allocatable :: a allocate (a(len(s)/2)) read(unit=s,fmt='(*(Z2))') a

a, err := hex.DecodeString(s) if err != nil

s .split('') .map((el, ix, arr) => ix % 2 ? null : el + arr[ix + 1]) .filter(el => el !== null) .map(x => parseInt(x, 16))

byte[] a = new BigInteger(s, 16).toByteArray();

public static byte[] hexToByteArray(String s) < int len = s.length(); byte[] data = new byte[len / 2]; for (int i = 0; i < len; i += 2) < data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) return data; >

for i := 0 to length(s) div 2 - 1 do a[i] := StrToInt('$'+Copy(s,2*(i)+1,2));

let a: Vec = Vec::from_hex(s).expect("Invalid Hex String");

let a: Vec = decode(s).expect("Hex string should be valid");

let a: Vec = HEXLOWER_PERMISSIVE.decode(&s.into_bytes()).unwrap();

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How can I convert a hex string to a byte array in php

Below is the c# implementation

using System; public class Program < void CanDecodeFromString(string str) < if (str.Length % 2 != 0) return; //OutputText(" " + "J1939:" + "\r\n"); byte[] j1939data = new byte[str.Length / 2]; for (int i = 0; i < str.Length / 2; i++) < j1939data[i] = System.Convert.ToByte(str.Substring(2 * i, 2), 16); >//J1939DataDecode(j1939data); Console.WriteLine(String.Join("\n", j1939data)); > public static void Main() < var p= new Program(); p.CanDecodeFromString("31058F410C15E1310D48312F8F41310000630220290082"); Console.WriteLine("Hello World"); >> Copy code

hex_string="31058F410C15E1310D48312F8F41310000630220290082" hex_data = hex_string.decode("hex") import array array.array('B', hex_data) Copy code

In php what is the proper way for it ?

49 5 143 65 12 21 225 49 13 72 49 47 143 65 49 0 0 99 2 32 41 0 130 Copy code

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PHP hex2bin() Function

The hex2bin() function converts a string of hexadecimal values to ASCII characters.

Syntax

Parameter Values

Technical Details

Return Value:	Returns the ASCII character of the converted string, or FALSE on failure
PHP Version:	5.4.0+
Changelog:	PHP 5.5.1 - Throws a warning if the string is invalid hexadecimal string. PHP 5.4.1 - Throws a warning if the string is of odd length. In 5.4.0, the string was silently accepted, but the last byte was removed.

❮ PHP String Reference

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