What are some best practices for efficiently replacing placeholders in HTML templates with PHP-generated content?

When replacing placeholders in HTML templates with PHP-generated content, it is best to use a combination of PHP's output buffering functions and string manipulation techniques. By capturing the HTML template content, replacing the placeholders with PHP-generated content, and then echoing the final result, you can efficiently generate dynamic HTML content.

<?php
// HTML template with placeholders
$htmlTemplate = '<h1>Hello, {name}!</h1>';

// PHP-generated content
$name = 'John Doe';

// Replace placeholders with PHP-generated content
ob_start();
echo str_replace('{name}', $name, $htmlTemplate);
$output = ob_get_clean();

// Output the final HTML content
echo $output;
?>