How can you handle the Hex representation of characters in PHP?

When working with hex representation of characters in PHP, you can use the `bin2hex()` function to convert a string of characters into its hexadecimal representation. To handle the hex representation, you can use the `hex2bin()` function to convert the hexadecimal representation back to the original string of characters.

// Convert string to hex representation
$string = "Hello, World!";
$hexRepresentation = bin2hex($string);
echo $hexRepresentation; // Output: 48656c6c6f2c20576f726c6421

// Convert hex representation back to string
$originalString = hex2bin($hexRepresentation);
echo $originalString; // Output: Hello, World!