What are common pitfalls when processing form data in PHP, such as validating passwords and ensuring they match?

One common pitfall when processing form data in PHP is not properly validating passwords and ensuring they match. To address this issue, you should use a secure password hashing algorithm like bcrypt and compare the hashed password with the hashed version stored in the database. 

// Validate and hash the password
$password = $_POST['password'];
$hashed_password = password_hash($password, PASSWORD_DEFAULT);

// Check if passwords match
if(password_verify($password, $hashed_password)) {
    // Passwords match, proceed with processing form data
} else {
    // Passwords do not match, display error message
    echo "Passwords do not match";
}

Keywords

form data PHP validation passwords matching

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