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Editorial Team
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Asked: 2026-06-10T00:31:22+00:00

I am using PHP’s exec() to convert an image using ImagicMagick’s convert . This

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I am using PHP’s exec() to convert an image using ImagicMagick’s convert. This is being run on a CentOS server.

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

Using exec() does not cause the new image to appear in the destination folder. However if I were to run the same command in the shell, it works perfectly!

I believe this is a PATH problem. If so, how can I check the path that PHP is using, and how can I set the correct path in PHP?

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1 Answer

  1. Editorial Team

    First, you should try with an input file that does indeed exist and is retrievable:

    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.

    Then, to see which convert your PHP uses:

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

    and

    cat /tmp/whichconvert.{1,2}

    Last, also try with the full path to convert:

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

    and then

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

    Update:

    The file that you meant to retrieve was probably not logo3w.png.jpg, but 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]

    Also, in case it works for local files only (not remote http-URIs) you may need to check if the http delegate used by convert is indeed installed on your system:

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

    Plus, check if the user account your PHP runs under does indeed have the right to write to the target directory:

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

    and then

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