PHP escapeshellcmd（）使用'>'字符打破ImageMagick转换命令(PHP escapeshellcmd() breaks ImageMagick convert command using '>' character)

 我在Ubuntu 12服务器上使用ImageMagick 6.6.9。 我遇到的问题是我的ImageMagick转换命令，我使用shell_exec函数运行PHP（但也尝试过exec ），其中包含PHP escapeshellcmd函数转义的字符\ 
 
 这是我的PHP代码： 
 
$result = exec(escapeshellcmd($convertString));
 
 这是我的示例转换命令： 
 
 /usr/bin/convert "/Users/rich/Sites/example/1234.JPG" -quality 85 -auto-orient -thumbnail "640x88>" "/Users/rich/Sites/example/1234-thumb.jpg" 
 
 最后这里是转换命令，它通过escapeshellcmd运行： 
 
 /usr/bin/convert "/Users/rich/Sites/example/1234.JPG" -quality 85 -auto-orient -thumbnail "640x88\>" "/Users/rich/Sites/example/1234-thumb.jpg" 
 
 问题是转义的\>字符会导致ImageMagick错误： 
 
 
 
 convert：选项-thumbnail的无效参数'：640x88> @ error / convert.c / ConvertImageCommand / 2770。 
 
 
 有谁知道我能解决这个问题的方法吗？ 我已经搜索了ImageMagick文档，当他们确认问题时，他们似乎没有提供任何其他方法来调整图像大小而不使用特殊的unix字符： 
 
 
 
 唯一收缩标志（'>'标志）是UNIX Shell和Window批处理脚本中的特殊字符，您需要转义该字符（在shell中使用反斜杠'>'，在Windows批处理中使用'^>'） 。 它也是HTML网页中的特殊内容，因此PHP脚本也可能需要一些特殊处理。 
 
 
 提前谢谢了。 

I'm using ImageMagick 6.6.9 on an Ubuntu 12 server. The problem I have is that my ImageMagick convert command, which I run through PHP using the shell_exec function (but have also tried exec), has characters in it which the PHP escapeshellcmd function escapes with a \
 
Here is my PHP code:
 
$result = exec(escapeshellcmd($convertString));
 
Here is my sample convert command:
 
/usr/bin/convert "/Users/rich/Sites/example/1234.JPG" -quality 85 -auto-orient -thumbnail "640x88>" "/Users/rich/Sites/example/1234-thumb.jpg"
 
And finally here is the convert command after it has been run through escapeshellcmd:
 
/usr/bin/convert "/Users/rich/Sites/example/1234.JPG" -quality 85 -auto-orient -thumbnail "640x88\>" "/Users/rich/Sites/example/1234-thumb.jpg"
 
The problem is that the escaped \> character results in an ImageMagick error: 
 
 
 
convert: invalid argument for option -thumbnail': 640x88> @ error/convert.c/ConvertImageCommand/2770.
 
 
Does anyone know of a way that I can get around this? I have trawled the ImageMagick documentation and while they acknowledge the problem they don't seem to provide any other way of resizing an image without using the special unix characters:
 
 
 
The Only Shrink Flag ('>' flag) is a special character in both UNIX Shell and in Window batch scripts, and you will need to escape that character (using backslash '>' in shell, and '^>' in windows batch). It is also special in and HTML web pages, so PHP scripts also may need some special handling.
 
 
Many thanks in advance.

原文：https://stackoverflow.com/questions/14477401