What are the potential issues with including PHP files that contain JavaScript in multiple pages?

Including PHP files that contain JavaScript in multiple pages can lead to code duplication and maintenance issues. To solve this problem, you can create a separate JavaScript file and include it in your PHP files using a single <script> tag. This way, you can centralize your JavaScript code and make it easier to manage and update.

// Separate JavaScript file (script.js)
// Contains all JavaScript code

// In your PHP file
&lt;script src=&quot;script.js&quot;&gt;&lt;/script&gt;