How can custom modules be created for a web interface using PHP?

To create custom modules for a web interface using PHP, you can start by defining the module's functionality in a separate PHP file. Then, include this file in your main PHP script where you want to use the module. This allows you to modularize your code and easily reuse the functionality across different parts of your web interface.

// custom_module.php
<?php

function customModuleFunction() {
    // Define the functionality of your custom module here
    return "Custom module function executed!";
}

?>

// main_script.php
<?php

include 'custom_module.php';

// Now you can call the custom module function in your main script
echo customModuleFunction();

?>