What potential pitfalls should be avoided when working with PHP and MySQL together?

One potential pitfall to avoid when working with PHP and MySQL together is SQL injection attacks. To prevent this, always use prepared statements with parameterized queries instead of directly inserting user input into SQL queries. 

// Using prepared statements to prevent SQL injection

// Establish a connection to the database
$mysqli = new mysqli("localhost", "username", "password", "database");

// Prepare a SQL statement with a parameterized query
$stmt = $mysqli->prepare("SELECT * FROM users WHERE username = ?");
$stmt->bind_param("s", $username);

// Set the parameter values and execute the query
$username = $_POST['username'];
$stmt->execute();

// Fetch the result
$result = $stmt->get_result();
while ($row = $result->fetch_assoc()) {
    // Process the data
}

// Close the statement and connection
$stmt->close();
$mysqli->close();

Keywords

SQL injection PDO prepared statements data validation error handling

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