What considerations should be made when using SQL data to determine which domains are allowed to display images generated by a PHP script?

When using SQL data to determine which domains are allowed to display images generated by a PHP script, it is important to validate the domain input to prevent SQL injection attacks. Additionally, consider implementing a whitelist approach where only approved domains are allowed to display images. You should also ensure that the SQL query is properly sanitized and that the image files are securely stored. 

// Validate the domain input to prevent SQL injection
$domain = filter_var($_GET['domain'], FILTER_VALIDATE_URL);

// Implement a whitelist approach
$allowed_domains = ['example.com', 'example2.com'];
if (!in_array($domain, $allowed_domains)) {
    die("Domain not allowed to display images.");
}

// Sanitize the SQL query
$domain = mysqli_real_escape_string($conn, $domain);

// Securely store image files
// Code for generating and displaying images

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