How can PHP developers ensure the security of their database queries, especially when dealing with user input?

To ensure the security of database queries when dealing with user input, PHP developers should use prepared statements with parameterized queries. This helps prevent SQL injection attacks by separating the SQL query logic from the user input data. 

// Establish a database connection
$pdo = new PDO('mysql:host=localhost;dbname=mydatabase', 'username', 'password');

// Prepare a SQL query using a parameterized statement
$stmt = $pdo->prepare('SELECT * FROM users WHERE username = :username');

// Bind the user input data to the prepared statement
$stmt->bindParam(':username', $_POST['username']);

// Execute the query
$stmt->execute();

// Fetch the results
$results = $stmt->fetchAll();

Keywords

SQL injection prepared statements PDO input validation escaping data

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