The `hex2bin()` string function in PHP8.4 converts a hexadecimal string into binary data. It is commonly used for decoding hex-encoded data back into its original binary form.

Syntax

<?php
string hex2bin(string $hex_string)
?>

$hex_string: A valid hexadecimal string (must have an even number of characters).
Returns: The binary data representation of the hexadecimal string.
Returns `false` if the input string is invalid (i.e., odd-length or non-hex characters).

Convert Hexadecimal to Binary

<?php
$hex = "48656c6c6f20504f";
$binary = hex2bin($hex);
echo $binary; // Output: Hello PO
?>

PHP 8.4 Behaviour

No major changes in PHP 8.4 for `hex2bin()`.
Works the same as in previous versions (PHP 5.4+).