In what ways can PHP developers prevent SQL injection vulnerabilities when interacting with databases in their code?

SQL injection vulnerabilities can be prevented by using prepared statements with parameterized queries when interacting with databases in PHP code. This approach ensures that user input is treated as data rather than executable code, thus preventing malicious SQL injection attacks. 

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

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

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

Keywords

SQL injection PHP PDO prepared statements parameterized queries input validation

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