How can PHP developers ensure security when fetching data from a database for a web interface?

To ensure security when fetching data from a database for a web interface, PHP developers should use prepared statements with parameterized queries to prevent SQL injection attacks. This method helps to sanitize user input and ensures that malicious SQL queries cannot be executed. 

// 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 value
$stmt->bindParam(':username', $_GET['username']);

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

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

// Loop through the results and display them
foreach ($results as $row) {
    echo $row['username'] . "<br>";
}

Keywords

SQL injection prepared statements PDO input validation cross-site scripting

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