What are some recommended methods for ensuring data security and preventing SQL injection in PHP when dealing with user input?

To ensure data security and prevent SQL injection in PHP when dealing with user input, it is recommended to use prepared statements with parameterized queries. This method helps sanitize user input and prevents malicious SQL injection attacks by separating SQL code from user data. 

// 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 statement
$stmt->execute();

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

// Use the results as needed
foreach ($results as $row) {
    echo $row['username'] . '<br>';
}

Keywords

Data security SQL injection PHP prepared statements input validation

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