What are the best practices for handling form submissions and passing data between webpages in PHP?

When handling form submissions in PHP, it is important to properly sanitize and validate user input to prevent security vulnerabilities such as SQL injection or cross-site scripting attacks. Additionally, passing data between webpages can be achieved using session variables or URL parameters. It is also recommended to use POST method for sensitive data and GET method for non-sensitive data. 

// Example of handling form submission and passing data between webpages in PHP

// Handle form submission
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $username = $_POST['username'];
    $password = $_POST['password'];
    
    // Sanitize and validate input
    $username = filter_var($username, FILTER_SANITIZE_STRING);
    $password = filter_var($password, FILTER_SANITIZE_STRING);
    
    // Perform necessary actions with the data
    
    // Redirect to another page with data
    header("Location: another_page.php?username=$username");
    exit();
}

// Retrieve data passed from another page
if (isset($_GET['username'])) {
    $username = $_GET['username'];
    // Use the data as needed
}

Keywords

form submissions data passing webpages PHP functions error handling

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