What common issue arises when using PHP to validate user input in a form submission?

One common issue that arises when using PHP to validate user input in a form submission is the lack of proper sanitation, which can lead to security vulnerabilities such as SQL injection attacks. To solve this issue, it is important to sanitize and validate user input before using it in database queries or other sensitive operations. This can be done using functions like htmlspecialchars() to prevent cross-site scripting attacks and prepared statements to prevent SQL injection. 

// Sanitize and validate user input from a form submission
$name = htmlspecialchars($_POST['name']);
$email = htmlspecialchars($_POST['email']);

// Use prepared statements to prevent SQL injection
$stmt = $pdo->prepare("INSERT INTO users (name, email) VALUES (:name, :email)");
$stmt->bindParam(':name', $name);
$stmt->bindParam(':email', $email);
$stmt->execute();

Keywords

SQL injection cross-site scripting form validation htmlspecialchars filter_input.

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