ImageMagick转换在命令行中工作,但不能通过PHP exec()

时间:2012-08-21 18:49:27

标签: php linux imagemagick centos

我正在使用PHP的exec()来使用ImagicMagick的convert转换图像。这是在CentOS服务器上运行。

exec(convert http://www.google.com/images/srpr/logo3w.png.jpg 
    -resize 640 /home/mysite/public_html/public/img/posts/original/1414_301a4.jpg);

使用exec()不会导致新图像出现在目标文件夹中。但是,如果我在shell中运行相同的命令,它可以完美运行!

我认为这是一个路径问题。如果是这样,我如何检查PHP正在使用的路径,以及如何在PHP中设置正确的路径?

3 个答案:

答案 0 :(得分:4)

function execute($command)
{
    # remove newlines and convert single quotes to double to prevent errors
    $command = str_replace(array("\n", "'"), array('', '"'), $command);
    # replace multiple spaces with one
    $command = preg_replace('#(\s){2,}#is', ' ', $command);
    # escape shell metacharacters
    $command = escapeshellcmd($command);
    # execute convert program
    return shell_exec($command); // or whatever you like
}

答案 1 :(得分:3)

首先,您应该尝试使用确实存在且可检索的输入文件:

wget http://www.google.com/images/srpr/logo3w.png.jpg

  --2012-08-21 20:55:24--  http://www.google.com/images/srpr/logo3w.png.jpg
  Resolving www.google.com (www.google.com)... 173.194.35.179, 173.194.35.177, 173.194.35.178, ...
  Connecting to www.google.com (www.google.com)|173.194.35.179|:80... connected.
  HTTP request sent, awaiting response... 404 Not Found
  2012-08-21 20:55:24 ERROR 404: Not Found.

然后,查看您的PHP使用的convert

exec(which convert 2>/tmp/whichconvert.2 1>whichconvert.1)

cat /tmp/whichconvert.{1,2}

最后还尝试使用convert的完整路径:

exec(/usr/local/full/path/to/convert logo: 
-resize 640 /home/mysite/public_html/public/img/posts/original/1414_301a4.jpg);

然后

identify /home/mysite/public_html/public/img/posts/original/1414_301a4.jpg

更新

您要检索的文件可能不是logo3w.png.jpg,而是logo3w.png

  wget http://www.google.com/images/srpr/logo3w.png
  --2012-08-21 21:04:22--  http://www.google.com/images/srpr/logo3w.png
  Resolving www.google.com (www.google.com)... 173.194.35.180, 173.194.35.177, 173.194.35.179, ...
  Connecting to www.google.com (www.google.com)|173.194.35.180|:80... connected.
  HTTP request sent, awaiting response... 200 OK
  Length: 7007 (6.8K) [image/png]
  Saving to: ‘logo3w.png’

  100%[=====================================================>] 7,007       --.-K/s   in 0.02s   

  2012-08-21 21:04:22 (451 KB/s) - ‘logo3w.png’ saved [7007/7007]

此外,如果它只适用于本地文件(不是远程http-URI),您可能需要检查convert使用的 http委托确实安装在你的系统上:

convert -list delegate | grep http
      https =>          "/opt/local/bin/curl" -s -k -o "%o" "https:%M"

另外,检查您运行PHP的用户帐户是否确实有权写入目标目录:

exec(touch /home/mysite/public_html/public/img/posts/original/touchtest);

然后

ls -l  /home/mysite/public_html/public/img/posts/original/touchtest

答案 2 :(得分:0)

对我有用的是提供ImageMagick二进制文件的完整路径。而不是convert,请使用/path/to/convert

$command = $this->imageMagickFullBinaryPath . ' -resize ' . $dimensions . 
           ' ' . $imageFileToResize . ' ' . $resultingThumbnail; 
exec($command, $output);