How does using the HTML "required" attribute compare to using PHP to handle input field validation in a contact form?

Using the HTML "required" attribute is a client-side validation method that prompts the user to fill out a required field before submitting the form. However, it can be bypassed by disabling JavaScript. On the other hand, using PHP for input field validation is a server-side method that ensures data integrity and security by validating the input data before processing it. 

// Check if the form is submitted
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Validate the input fields
    $name = $_POST["name"];
    $email = $_POST["email"];
    
    if (empty($name) || empty($email)) {
        echo "Please fill out all required fields.";
    } else {
        // Process the form data
        // Additional validation and processing code here
    }
}

Keywords

HTML required attribute PHP input validation contact form

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