PHP - 垂直组合两个图像

Question

我在我的 Laravel 应用程序中组合了两个图像，它可以在我的本地机器上运行。但是底部图像在我的 Ubuntu 服务器上消失了。所有图像均小于 100kb。内存限制设置为 -1。

注意：在合并之前，我将顶部图像转换为与底部图像具有相同宽度。

$top_image_path = '/textImage.jpg';
$bottom_image_path = '/blueImage.jpg';

list($top_image_width, $top_image_height) = getimagesize($top_image_path);
list($bottom_image_width, $bottom_image_height) = getimagesize($bottom_image_path);

$merged_width = $bottom_image_width;
$merged_height = $top_image_height + $bottom_image_height;

$merged_image = imagecreatetruecolor($merged_width, $merged_height);

imagealphablending($merged_image, false);
imagesavealpha($merged_image, true);

$img1 = imagecreatefromjpeg($top_image_path);
$img2 = imagecreatefromjpeg($bottom_image_path);

imagecopy($merged_image, $img1, 0, 0, 0, 0, $top_image_width, $top_image_height);
imagecopy($merged_image, $img2, 0, $bottom_image_width, 0, 0, $bottom_image_width, $bottom_image_height);

imagejpeg($merged_image, 'merged_image.jpg'); 

结果：

我本地机器上的输出图像：

Ubuntu 服务器上的输出图像：

Answer 1

我认为该行存在以下问题。

imagecopy($merged_image, $img2, 0, $top_image_height, 0, 0, $bottom_image_width, $bottom_image_height);