PHP function hex2bin() that converts a string of hexadecimal values ​​into ASCII characters

Example

Convert hexadecimal value to ASCII character:

<?php
echo hex2bin("48656c6c6f20576f726c6421");
?>

Output result of the above example:

Hello World!

Definition and usage

hex2bin () function converts a string of hexadecimal values ​​into ASCII characters.

Syntax

hex2bin(string)

Parameters Description

string Required. The hexadecimal value to convert. ​

Technical details

Return value: ​ ​ ​ Returns the ASCII characters of the converted string, or FALSE if it fails. ​

PHP Version: ​ 5.4.0+ ​

Update Log: ​ Since PHP 5.4.1, if the string length is odd, a warning is thrown. In PHP 5.4.0, odd strings are silently accepted, but the last byte is removed.

                         Since PHP 5.5.1, a warning is thrown if the string is an invalid hexadecimal string.

There is a bin2hex method in php, but there is no hex2bin method. The following is a simple implementation of hex2bin:

<?php
function hex2bin($data) {
$len = strlen($data);
return pack("H" . $len, $data); } 
?>

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