How can the use of include() function in PHP help in combining multiple files for streamlined functionality?

Using the include() function in PHP allows us to combine multiple files into a single file, which can streamline functionality by organizing code into separate modules. This can make the code easier to manage, update, and reuse across different parts of a project.

// Example of using include() function to combine multiple files

// File: header.php
echo "Header content here";

// File: sidebar.php
echo "Sidebar content here";

// File: footer.php
echo "Footer content here";

// File: index.php
include('header.php');
include('sidebar.php');
// Main content goes here
include('footer.php');