为$ bgd_color传递-1时php gd imagerotate失败 [英] php gd imagerotate fails when -1 is passed for $bgd_color

问题描述

我在客户端服务器上遇到了这个问题

I had this problem on a client server

$tmp = imagerotate($tmp, $angle, -1);

$ tmp => bool(false)，不显示错误消息

$tmp => bool(false) with no error message displayed

$tmp = imagerotate($tmp, $angle, imagecolorallocatealpha($tmp, 0, 0, 0 , 127));

这很好用
$ tmp =>类型(gd)的 resource(89)

应该更改哪个服务器配置变量以使-1工作?

What server configuration variable should be changed to make -1 work ?

GD Version: bundled (2.1.0 compatible)
libPNG Version: 1.2.44

推荐答案

应该更改哪些服务器配置变量以使-1正常工作?"

"What server configuration variable should be changed to make -1 work?"

没有服务器配置变量可以使此工作正常进行.我遇到了与您相同的问题(使用第三方库时)，发现传递-1的人非常幸运，它确实起作用了.根据我的研究，我相信发生了什么事，一个人使用了它，它起作用了，并且代码只是复制到了各个项目中而没有真正了解它的功能.我之所以这样说，是因为我在各个项目中看到的是完全相同的代码，包括注释.

There is no server configuration variable that makes this work. I ran in to the same issue as you (while using a third party library) and discovered that those who were passing in -1 were pretty much lucky that it did work. Based on my research I believe what happened was one person used this, it worked, and the code just got copied into various projects without a real understanding of it's function. I say this because I see the same exact code, including comments, in various projects.

gd库的更高版本改变了某些行为，打破了将-1作为背景色传递给那些人的 imagerotate 函数.

Later versions of the gd library changed the behavior some, breaking the imagerotate function for those who were passing in -1 as the background color.

无论如何，解决方案是使用 imagecolorallocatealpha 向图像调色板添加透明的颜色"，并将该颜色作为背景色传递给 imagerotate .您的解决方案: $ tmp = imagerotate($ tmp，$ angle，imagecolorallocatealpha($ tmp，0，0，0，127)); 应该很好.

Anyway, the solution is to use imagecolorallocatealpha to add a transparent "color" to the image palette, and pass that color as the background color to imagerotate. Your solution of: $tmp = imagerotate($tmp, $angle, imagecolorallocatealpha($tmp, 0, 0, 0 , 127)); should be just fine.

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