What potential pitfalls should be considered when integrating a custom CMS with Joomla or WordPress?

One potential pitfall when integrating a custom CMS with Joomla or WordPress is the risk of conflicting functions or naming conventions between the custom CMS and the existing platform. To avoid this issue, it is important to carefully namespace all custom functions and variables to prevent any clashes with the Joomla or WordPress core code.

// Example of namespacing custom functions in PHP

// Define a unique namespace for custom functions
namespace CustomCMS;

// Custom function within the namespace
function custom_function() {
    // Function code here
}