imagecopy并非一直有效 [英] imagecopy doesn't work all the time

问题描述

我遇到imagecopy问题，即使在工作示例和不工作示例上都出现了PNG，但$url变量上的某些图像也不会出现. $local变量从服务器加载透明图像，而$url变量从远程服务器加载.我已经为$local灌装了一张测试透明图像.

I'm having an issue with imagecopy certain images on the $url variable will not appear even though there both PNG on the working and not working examples. The $local variable loads transparent images from the server and $url variable loads from a remote server. I have inculded a test transparent image for $local.

工作:

<?php
header("Content-type: image/png");
$url = imagecreatefrompng("url_removed.png");
$local = imagecreatefrompng("http://url_removed.png");
imagecopy($url, $local, 0, 0, 0, 0, 100, 100);
imagepng($url);
imagedestroy($url);
imagedestroy($local);
?>

不起作用:

<?php
header("Content-type: image/png");
$url = imagecreatefrompng("url_removed.png");
$local = imagecreatefrompng("http://url_removed.png");
imagecopy($url, $local, 0, 0, 0, 0, 100, 100);
imagepng($url);
imagedestroy($url);
imagedestroy($local);
?>

我什至尝试用file_get_contents进行imagecreatestring，并且也可以工作，但是某些PNG图像却不能像imagecreatefrompng

I have even tried imagecreatestring with file_get_contents and that works also but certain PNG images it doesn't work just like with imagecreatefrompng

说完之后，我认为这与imagecopy有关系....我该怎么做才能解决此问题，或者还有另一种简单的方法可以做到这一点?

After all that said in done, I think it has something to do with imagecopy.... what can I do to fix this or is there another simple way of doing this?

推荐答案

我将同时测试这两种代码，并且有效

i'd test with both codes, and it works

<?php
header("Content-type: image/png");
$url = imagecreatefrompng("http://i.imgur.com/F7Jpk9y.png");
$local = imagecreatefrompng("http://i.imgur.com/0A81XrP.png");
// use imagecopymerge instead and set the copied image opacity to 50
imagecopymerge($url, $local, 0, 0, 0, 0, 64, 64,50); 
imagepng($url);
imagedestroy($url);
imagedestroy($local);
?>

输出 http://imgur.com/kMqQbrr

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