如何使用PHP和GD截取网站的屏幕截图？

php -i | grep "GD"

<?php
function screenshot($url, $output_file) {
    $width = 1280;
    $height = 720;

    $image = imagecreatetruecolor($width, $height);
    $black = imagecolorallocate($image, 0, 0, 0);
    imagefill($image, 0, 0, $black);

    $url_data = file_get_contents($url);
    $dom = new DOMDocument();
    @$dom->loadHTML($url_data);

    $tags = $dom->getElementsByTagName('img');
    foreach ($tags as $tag) {
        $src = $tag->getAttribute('src');
        $filename = pathinfo($src, PATHINFO_BASENAME);
        $filepath = 'images/' . $filename;
        file_put_contents($filepath, file_get_contents($src));
        $image_data = getimagesize($filepath);
        $image_type = $image_data[2];
        switch ($image_type) {
            case IMAGETYPE_JPEG:
                $image_resource = imagecreatefromjpeg($filepath);
                break;
            case IMAGETYPE_PNG:
                $image_resource = imagecreatefrompng($filepath);
                break;
            case IMAGETYPE_GIF:
                $image_resource = imagecreatefromgif($filepath);
                break;
            default:
                $image_resource = false;
                break;
        }
        if ($image_resource !== false) {
            list($image_width, $image_height) = getimagesize($filepath);
            $dest_x = 0;
            $dest_y = 0;
            $src_x = 0;
            $src_y = 0;
            if ($image_width > $width) {
                $src_x = ($image_width - $width) / 2;
                $image_width = $width;
            }
            if ($image_height > $height) {
                $src_y = ($image_height - $height) / 2;
                $image_height = $height;
            }
            imagecopyresampled($image, $image_resource, $dest_x, $dest_y, $src_x, $src_y, $image_width, $image_height, $image_width, $image_height);
        }
    }
    imagepng($image, $output_file);
    imagedestroy($image);
}

$url = "https://www.example.com";
$output_file = "screenshot.png";
screenshot($url, $output_file);
echo "Screenshot taken!";
?>