How can PHP developers prevent SQL injection vulnerabilities when implementing encryption and decryption functions?

To prevent SQL injection vulnerabilities when implementing encryption and decryption functions in PHP, developers should use prepared statements with parameterized queries to sanitize user input before executing SQL queries. This helps to prevent malicious SQL code from being injected into the queries. 

// Example code snippet using prepared statements to prevent SQL injection

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

// Prepare SQL statement with placeholders
$stmt = $pdo->prepare("SELECT * FROM users WHERE username = :username");

// Bind parameters
$stmt->bindParam(':username', $_POST['username']);

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

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

Keywords

PHP SQL injection encryption decryption security

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