Are there any best practices for securely retrieving and displaying data from external sources in PHP?

When retrieving and displaying data from external sources in PHP, it is crucial to follow best practices to ensure the security of your application. One common method is to sanitize and validate the data before displaying it to prevent SQL injection attacks or cross-site scripting vulnerabilities. Additionally, consider using prepared statements when interacting with databases to prevent injection attacks. 

// Example code snippet for securely retrieving and displaying data from external sources in PHP

// Sanitize and validate the data retrieved from the external source
$externalData = filter_var($_GET['data'], FILTER_SANITIZE_STRING);

// Use prepared statements when interacting with databases
$stmt = $pdo->prepare('SELECT * FROM table WHERE column = :data');
$stmt->bindParam(':data', $externalData);
$stmt->execute();

// Display the retrieved data after sanitizing and validating
echo htmlentities($externalData);

Keywords

SQL injection cross-site scripting PDO prepared statements data validation

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