What potential pitfalls should be avoided when generating text on an image in PHP?

One potential pitfall when generating text on an image in PHP is not properly sanitizing user input, which can lead to security vulnerabilities such as cross-site scripting (XSS) attacks. To avoid this, always sanitize any user input before using it to generate text on an image. Additionally, make sure to properly handle and validate the input to prevent any unexpected or malicious content from being displayed on the image. 

// Sanitize user input before generating text on image
$text = filter_var($_POST['text'], FILTER_SANITIZE_STRING);

// Validate input to prevent unexpected content
if(strlen($text) > 50) {
    $text = substr($text, 0, 50); // Limit text length to 50 characters
}

// Generate text on image
$font = 'path/to/font.ttf';
$size = 12;
$angle = 0;
$x = 10;
$y = 10;
$color = imagecolorallocate($image, 255, 255, 255);
imagettftext($image, $size, $angle, $x, $y, $color, $font, $text);

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