What security measures should be implemented in PHP code to prevent SQL injection vulnerabilities?

SQL injection vulnerabilities can be prevented in PHP code by using prepared statements with parameterized queries. This approach separates the SQL query from the user input, preventing malicious input from being executed as SQL commands. By binding parameters to the query, the database engine can distinguish between the actual SQL command and the user input, effectively mitigating the risk of 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 parameter to a specific value
$stmt->bindParam(':username', $_POST['username']);

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

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

Keywords

SQL injection PHP code security measures vulnerabilities prevention

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