What are the potential pitfalls of using global constants for accessing helper classes in PHP?

Using global constants for accessing helper classes in PHP can lead to namespace collisions and potential conflicts with other constants defined in the application. To avoid this issue, it is recommended to use PHP namespaces to encapsulate helper classes and prevent naming conflicts.

namespace MyNamespace;

class HelperClass {
    // Helper class code here
}

// Accessing the helper class using namespaces
$helper = new MyNamespace\HelperClass();