How can PHP developers ensure that form submissions are properly detected and processed to avoid issues with data manipulation?

To ensure that form submissions are properly detected and processed to avoid issues with data manipulation, PHP developers can implement server-side validation and sanitization of form input. This involves checking the data submitted through the form for any malicious or unexpected content before processing it further. 

// Server-side validation and sanitization of form input
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $username = filter_var($_POST["username"], FILTER_SANITIZE_STRING);
    $email = filter_var($_POST["email"], FILTER_SANITIZE_EMAIL);
    
    // Validate input
    if (empty($username) || empty($email)) {
        echo "Please fill in all fields.";
    } else {
        // Process the form data
        // Additional processing code here
    }
}

Keywords

PHP form submissions data manipulation validation security

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