What potential pitfalls should be avoided when passing input data from one PHP page to another using forms?

One potential pitfall to avoid when passing input data from one PHP page to another using forms is not properly sanitizing the input data to prevent SQL injection or cross-site scripting attacks. To mitigate this risk, always use prepared statements or input validation functions to sanitize user input before passing it to the next page. 

// Sanitize input data before passing to the next page
$input_data = $_POST['input_data'];
$sanitized_data = filter_var($input_data, FILTER_SANITIZE_STRING);

// Pass the sanitized data to the next page using a form
echo "<form action='next_page.php' method='post'>";
echo "<input type='hidden' name='sanitized_data' value='" . $sanitized_data . "'>";
echo "<input type='submit' value='Submit'>";
echo "</form>";

Keywords

XSS SQL injection form validation $_POST $_GET

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