我可以水平/垂直翻转图像，但无法使用 GD2 库旋转它们
我正在开发一项功能，允许图像以 90 度的增量旋转或水平或垂直翻转。我的代码在我自己的计算机上运行得很好，但是当上传到实时服务器时，旋转功能停止工作。图像仍然可以翻转，但旋转它们不会导致任何变化。没有错误消息。执行旋转的函数返回与旋转成功相同的值。这不是需要重新加载页面的情况（我已经尝试过）。旋转图像后，我应该能够在服务器上找到图像文件，并发现它确实已旋转，但这种情况没有发生。
令人难以置信的部分是翻转功能仍然有效，只是旋转功能停止工作。有谁知道这种情况是否是由服务器设置中的某些内容引起的？也许是不同版本的 GD2 库？我不认为这是代码问题，而是实时服务器的某些不同之处导致了此问题。任何帮助将不胜感激。
I am developing a feature to allow an image to be rotated in increments of 90 degrees or to be flipped horizontally or vertically. I have the code working just fine on my own computer, but when uploaded to a live server, the rotate functionality stops working. The images can still be flipped, but rotating them results in no change at all. There are no error messages. The function that performs the rotation returns the same value as if the rotation was successful. This isn't a case of needing to reload the page (I've tried that). After rotating the image I should be able to find the image file on the server and find that it has indeed been rotated, but that is not happening.
The mind-boggling part of this is that the flipping functionality still works, it's just the rotation functionality that stopped working. Does anyone know if this sort of thing can be caused by something in the server setup? Maybe a different version of the GD2 library? I don't believe that this is a code problem, rather that there's something different about the live server that causes this. Any help would be appreciated.
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查看演示和教程 http://www.innovativephp.com/online-image-rotator-using-php-gd-library-for-improving-design-tasks/ 了解如何使用 php gd 旋转图像的完整详细信息
Check out the demo and tutorial at http://www.innovativephp.com/online-image-rotator-using-php-gd-library-for-improving-design-tasks/ for complete details on how to rotate an image with php gd