What are the potential pitfalls of defining image sizes using constants in PHP?

Defining image sizes using constants in PHP may lead to inflexibility when needing to change the sizes in the future, as constants cannot be changed dynamically at runtime. To solve this issue, you can use variables instead of constants to define image sizes, allowing for more flexibility in adjusting the sizes as needed.

// Define image sizes using variables
$imageWidth = 500;
$imageHeight = 300;

// Use the variables in your code
$image = imagecreatetruecolor($imageWidth, $imageHeight);