What best practices should be followed when handling graphics in dynamically generated content using PHP?

When handling graphics in dynamically generated content using PHP, it is important to properly sanitize user input to prevent security vulnerabilities such as cross-site scripting attacks. Additionally, it is recommended to use image manipulation libraries like GD or Imagick to resize, crop, or manipulate images as needed. Finally, consider caching generated images to improve performance and reduce server load. 

// Example of sanitizing user input for image file upload
$allowedExtensions = ['jpg', 'jpeg', 'png', 'gif'];
$uploadPath = '/path/to/upload/directory/';

if(isset($_FILES['image']) && $_FILES['image']['error'] == 0){
    $fileExtension = pathinfo($_FILES['image']['name'], PATHINFO_EXTENSION);
    
    if(in_array($fileExtension, $allowedExtensions)){
        $newFileName = uniqid() . '.' . $fileExtension;
        move_uploaded_file($_FILES['image']['tmp_name'], $uploadPath . $newFileName);
        echo 'Image uploaded successfully!';
    } else {
        echo 'Invalid file extension. Allowed extensions are jpg, jpeg, png, gif.';
    }
}

Keywords

GD library imagecreatefromstring imagejpeg imagepng imagegif

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