What are common pitfalls when using HTML code for form submission in PHP?

One common pitfall when using HTML code for form submission in PHP is not properly sanitizing user input, leaving the application vulnerable to SQL injection attacks. To solve this issue, always use prepared statements or parameterized queries to interact with the database, instead of directly inserting user input into SQL queries. 

// Example of using prepared statements to sanitize user input for form submission in PHP

// Get user input from form submission
$username = $_POST['username'];
$password = $_POST['password'];

// Prepare a SQL statement using prepared statements
$stmt = $pdo->prepare("INSERT INTO users (username, password) VALUES (:username, :password)");

// Bind parameters and execute the statement
$stmt->bindParam(':username', $username);
$stmt->bindParam(':password', $password);
$stmt->execute();

Keywords

HTML form submission PHP security vulnerabilities validation.

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