How can one safely handle hexadecimal inputs in PHP to avoid unexpected results or errors?

When handling hexadecimal inputs in PHP, it's important to validate and sanitize the input to avoid unexpected results or errors. One way to do this is by using the `ctype_xdigit()` function to check if the input contains only hexadecimal characters. Additionally, you can use `hex2bin()` function to convert the hexadecimal input to binary data safely.

$input = "1A2F"; // Hexadecimal input

// Validate input
if (ctype_xdigit($input)) {
    // Convert hexadecimal input to binary data
    $binaryData = hex2bin($input);

    // Use $binaryData safely in your application
    echo "Binary data: " . $binaryData;
} else {
    echo "Invalid hexadecimal input";
}