What are common issues when transferring form data between PHP pages, such as in the scenario described in the forum thread?

Common issues when transferring form data between PHP pages include not properly sanitizing user input, not using the correct method to retrieve form data (e.g., using $_GET instead of $_POST), and not checking if the form fields are set before accessing them. To solve these issues, ensure that user input is sanitized to prevent SQL injection and other security vulnerabilities, use the appropriate method to retrieve form data, and check if form fields are set before accessing them to avoid undefined index errors. 

// Sanitize user input
$username = htmlspecialchars($_POST['username']);
$password = htmlspecialchars($_POST['password']);

// Check if form fields are set before accessing them
if(isset($_POST['submit'])) {
    // Process form data
}

Keywords

session variables form validation POST method data sanitization error handling

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