Are there any best practices for organizing PHP files and structuring dynamic content to avoid repetitive code changes on multiple pages?

To avoid repetitive code changes on multiple pages when dealing with dynamic content in PHP, it is best to organize your PHP files and structure your code in a modular way. One way to achieve this is by using includes or requires to separate common functionality into separate files that can be included where needed. By doing so, you can make updates or changes in one place and have them reflected across multiple pages.

// common.php
function displayHeader() {
    // code for displaying header
}

function displayFooter() {
    // code for displaying footer
}

// page1.php
require_once('common.php');
displayHeader();
// code specific to page 1
displayFooter();

// page2.php
require_once('common.php');
displayHeader();
// code specific to page 2
displayFooter();