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What are some common pitfalls when debugging PHP code that processes form submissions?

One common pitfall when debugging PHP code that processes form submissions is not properly sanitizing user input, which can lead to security vulnerabilities such as SQL injection or cross-site scripting attacks. To solve this issue, always use functions like htmlspecialchars() or mysqli_real_escape_string() to sanitize user input before using it in SQL queries or displaying it on the webpage.

php 
// Example of sanitizing user input using htmlspecialchars()
$name = htmlspecialchars($_POST['name']);
$email = htmlspecialchars($_POST['email']);
$message = htmlspecialchars($_POST['message']);

// Example of sanitizing user input using mysqli_real_escape_string()
$conn = mysqli_connect("localhost", "username", "password", "dbname");
$name = mysqli_real_escape_string($conn, $_POST['name']);
$email = mysqli_real_escape_string($conn, $_POST['email']);
$message = mysqli_real_escape_string($conn, $_POST['message']);

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