What are some best practices for securely passing data to SQL statements in PHP?

When passing data to SQL statements in PHP, it is important to use prepared statements with parameterized queries to prevent SQL injection attacks. This involves binding variables to placeholders in the SQL query, which ensures that user input is treated as data rather than executable code. 

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

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

// Bind the parameter to a variable
$username = $_POST['username'];
$stmt->bindParam(':username', $username);

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

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

Keywords

SQL injection prepared statements PDO mysqli_real_escape_string parameterized queries

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