What best practices should be followed when using prepared statements in PHP for database queries?

To prevent SQL injection attacks and improve performance, it is recommended to use prepared statements in PHP for database queries. This involves separating SQL query logic from user input by using placeholders for dynamic values, which are then bound to parameters before execution. This 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 placeholders
$stmt = $pdo->prepare('SELECT * FROM users WHERE username = :username');

// Bind parameters to placeholders
$stmt->bindParam(':username', $username, PDO::PARAM_STR);

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

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

Keywords

SQL injection PDO bindParam execute security

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