What are some common mistakes to avoid when writing PHP code for database manipulation?

One common mistake to avoid when writing PHP code for database manipulation is not using prepared statements to prevent SQL injection attacks. To solve this issue, always use prepared statements with parameterized queries to securely interact with the database. 

// Incorrect way without prepared statements (vulnerable to SQL injection)
$username = $_POST['username'];
$password = $_POST['password'];

$query = "SELECT * FROM users WHERE username='$username' AND password='$password'";
$result = mysqli_query($conn, $query);

// Correct way using prepared statements
$username = $_POST['username'];
$password = $_POST['password'];

$query = "SELECT * FROM users WHERE username=? AND password=?";
$stmt = $conn->prepare($query);
$stmt->bind_param("ss", $username, $password);
$stmt->execute();
$result = $stmt->get_result();

Keywords

SQL injection PDO prepared statements error handling database transactions

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