What are common challenges faced when extending PHP scripts based on templates?

One common challenge faced when extending PHP scripts based on templates is maintaining consistency and readability across different template files. To address this, it is important to establish a clear naming convention for variables and functions used in templates, as well as organizing template files in a structured manner. Additionally, using template inheritance can help reduce code duplication and make it easier to update and extend templates.

// Example of using template inheritance in PHP
// base_template.php
<!DOCTYPE html>
<html>
<head>
    <title><?php echo $title; ?></title>
</head>
<body>
    <?php echo $content; ?>
</body>
</html>

// extended_template.php
<?php
$title = "Extended Template";
ob_start();
?>
<h1>Welcome to the extended template!</h1>
<?php
$content = ob_get_clean();

include 'base_template.php';
?>