What are common pitfalls when integrating pre-made PHP scripts into a custom CMS?

Common pitfalls when integrating pre-made PHP scripts into a custom CMS include conflicting variable names, incompatible functions or classes, and styling conflicts. To solve these issues, it's important to carefully review the code of both the pre-made script and the custom CMS, and make necessary adjustments to ensure compatibility.

// Example code snippet to avoid conflicting variable names
// Prefix variables in the pre-made script to prevent conflicts

$premade_variable = "value";

// Example code snippet to avoid incompatible functions or classes
// Use namespaces or rename functions/classes to prevent conflicts

namespace PreMadeScript;

class PreMadeClass {
    public function preMadeFunction() {
        // Function code
    }
}

// Example code snippet to avoid styling conflicts
// Use unique CSS classes or IDs to style elements from the pre-made script

<div class="premade-element">
    <!-- Element content -->
</div>