How can PHP developers ensure clean and efficient code when combining PHP and HTML elements for dynamic web content?

To ensure clean and efficient code when combining PHP and HTML elements for dynamic web content, PHP developers should separate their PHP logic from their HTML markup by using PHP's echo or print statements to inject dynamic content into HTML templates. This separation of concerns makes the code easier to read, maintain, and debug. Additionally, developers should avoid mixing PHP logic within HTML tags, as it can lead to messy and hard-to-manage code.

<?php
// Example of separating PHP logic from HTML markup
$name = "John Doe";
$age = 30;

// Separate PHP logic from HTML markup
echo "<p>Name: " . $name . "</p>";
echo "<p>Age: " . $age . "</p>";
?>