PHP Manual: hex2bin

function hex2bin(string $string): string|false

Decodes a hexadecimally encoded binary string.

Caution

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

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

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

Example #1 hex2bin() example

<?php
$hex = hex2bin("6578616d706c65206865782064617461");
var_dump($hex);
?>

The above example will output something similar to:

string(16) "example hex data"

hex2bin