How can PHP code be effectively separated from HTML in practice, especially when dealing with input forms and database interactions?

To effectively separate PHP code from HTML, one common practice is to use a template system like PHP includes or a template engine such as Twig. This allows for clean separation of logic and presentation, making the code easier to maintain and understand. When dealing with input forms and database interactions, it's important to keep the PHP code responsible for processing data separate from the HTML code responsible for displaying it. 

<?php
// Separate PHP logic from HTML presentation using a template system
include 'header.php';

// Process form data
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Handle form submission
}

// Retrieve data from database
$query = "SELECT * FROM table";
$result = mysqli_query($conn, $query);

// Display data in HTML
while ($row = mysqli_fetch_assoc($result)) {
    echo "<div>{$row['column']}</div>";
}

include 'footer.php';
?>

Keywords

PHP separation of concerns MVC pattern PDO form handling

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