What best practices should be followed when integrating PHP with HTML for interactive elements like calculators?

When integrating PHP with HTML for interactive elements like calculators, it is best to separate the PHP logic from the HTML markup to maintain clean and organized code. This can be achieved by using PHP to handle the calculations and then echoing the results back into the HTML elements as needed. Additionally, utilizing form submissions and POST requests can help pass user input data to the PHP script for processing. 

<?php
if(isset($_POST['submit'])){
    $num1 = $_POST['num1'];
    $num2 = $_POST['num2'];
    
    $result = $num1 + $num2;
}
?>

<form method="POST">
    <input type="text" name="num1" placeholder="Enter number 1">
    <input type="text" name="num2" placeholder="Enter number 2">
    <input type="submit" name="submit" value="Calculate">
</form>

<?php
if(isset($result)){
    echo "The result is: " . $result;
}
?>

Keywords

PHP HTML integration interactive elements calculators

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