What is the error message "Call to undefined function: imagegif()" indicating in PHP?

The error message "Call to undefined function: imagegif()" indicates that the GD library function imagegif() is not available or enabled in your PHP installation. To solve this issue, you need to enable the GD library extension in your PHP configuration.

// Check if the GD library is enabled
if (!function_exists('imagegif')) {
    die('GD library is not enabled');
}

// Your code using imagegif() function goes here