Are there any potential pitfalls in using PHP to generate verification images?

One potential pitfall in using PHP to generate verification images is the risk of exposing sensitive information in the image file itself, such as the verification code or other confidential data. To mitigate this risk, it is important to ensure that the image file does not contain any sensitive information and that proper security measures are in place to protect the verification process.

// Generate a random verification code
$verificationCode = rand(1000, 9999);

// Create an image with the verification code
$image = imagecreate(100, 50);
$background = imagecolorallocate($image, 255, 255, 255);
$textColor = imagecolorallocate($image, 0, 0, 0);
imagestring($image, 5, 10, 10, $verificationCode, $textColor);

// Output the image to the browser
header('Content-type: image/png');
imagepng($image);
imagedestroy($image);