IM With PHP exec ()

[ngkong]

i have been crazy for a day now...

via command prompt, works fine OK

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/usr/local/bin/convert /home/xxxxx/public_html/pdf2img/images/pdf/temp/abcde.pdf[0] -colorspace RGB -geometry 200 /home/xxxxx/public_html/pdf2img/images/pdf/thumb/abcde.jpg

then i create a php file, test.php

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<?php
system("/usr/local/bin/convert /home/xxxxx/public_html/pdf2img/images/pdf/temp/abcde.pdf[0] -colorspace RGB -geometry 200 /home/xxxxx/public_html/pdf2img/images/pdf/thumb/abcde.jpg");
?>

it works fine when i execute it via command prompt:

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php test.php

but when i execute it via browser, nothing happen. i have tried 0777 the folders, chmod 0777 abcde.pdf, chgrp apache folders & file, chown apache folders & file

no luck

but the version reporting works fine

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<?php system("/usr/local/bin/convert --version"); ?>

thanks...

[Bonzo]

This should fail as you have --version rather than -version

<?php system("/usr/local/bin/convert --version"); ?>

Where did you get your path from ? Confirm it is correct with:

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<?php
echo "<pre>";
system("type convert"); 
echo "</pre>";
?> 

I use relative paths as they are easer than absoulte. Try something simple first to confirm the install is OK.
Put your pdf in the same folder as the code and run ( changing convert to your path ):

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<?php
$array=array();
echo "<pre>";
exec("convert abcde.pdf[0] abcde.jpg 2>&1", $array); 
echo "<br>".print_r($array)."<br>"; 
echo "</pre>";
?> 

This should also display any errors.

[ngkong]

convert is here: /usr/local/bin/convert

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<?php
$array=array();
echo "<pre>";
exec("/usr/local/bin/convert abcde.pdf[0] abcde.jpg 2>&1", $array);
echo "<br>".print_r($array)."<br>";
echo "</pre>";
?>

it produce:

Array
(
[0] => convert: missing an image filename `abcde.jpg'.
)

1

what does it mean?

touch abcde.jpg && chmod abcde.jpg

still no success...

thanks very much...

[Bonzo]

The error could be lots of things as it is not that detailed.

Do any other ImageMagic comands work with php e.g convert a jpg to a png ?

You need ghostscript installed to read pdf files. I wonder if there is a problem there, although you said it worked OK from the command line.

Otherwise I can not think of why it is not working.

[el_supremo]

I think that the problem is with the [0]
This tells IM to get the first page of the PDF.
BUT to PHP it is the index of an array and that is what PHP is complaining about.
You need to "escape" the brackets so that PHP doesn't interpret them.
From a previous post (viewtopic.php?f=1&t=9929) I think that quoting the filename will work:

exec("/usr/local/bin/convert 'abcde.pdf[0]' abcde.jpg 2>&1", $array);

Pete

[ngkong]

You need ghostscript installed to read pdf files. I wonder if there is a problem there, although you said it worked OK from the command line.

ghostscript is installed, i have recently converted hundreds of pdf files to jpg by php, called it via command prompt: php file.php

exec("/usr/local/bin/convert 'abcde.pdf[0]' abcde.jpg 2>&1", $array);
Pete

quote doesnt change anything

here abc.php:

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<?php
system("/usr/local/bin/convert 'abcde.pdf[0]' 'abcde.jpg' 2>&1");
?>

execute via command prompt, works perfect:

# php abc.php

**** Warning: Fonts with Subtype = /TrueType should be embedded.
The following fonts were not embedded:
TimesNewRomanPS-BoldMT
TimesNewRomanPSMT

**** This file had errors that were repaired or ignored.
**** The file was produced by:
**** >>>> Acrobat Distiller 6.0 (Windows) <<<<
**** Please notify the author of the software that produced this
**** file that it does not conform to Adobe's published PDF
**** specification.

call it via browser the same abc.php, no jpg produce, report:

sh: gs: command not found convert: Postscript delegate failed `abcde.pdf': No such file or directory. convert: missing an image filename `abcde.jpg'.

/usr/local/bin/gs is executable (0755)
active directory is writable (0777)

info:
Centos 5
Apache 2.2.3
PHP 5.1.6
Ghostscript 8.60
ImageMagick 6.3.7

This should fail as you have --version rather than -version

it's works! really...

# convert --version
Version: ImageMagick 6.3.7 11/17/07 Q16 http://www.imagemagick.org
Copyright: Copyright (C) 1999-2007 ImageMagick Studio LLC

thanks you all...

[ngkong]

well, as i can see it must be caused by the system doesnt know the location of gs command location while the command is executed by other user then root.

so how to configure the path of commands for a user in linux?

im a linux n00b and i have been googling and found nothing...

thanks

[anthony]

set PATH environment variable in the PHP. or tell your administartors that the PHP command path is not set right for IM and GS

If the web server has the right path. PHP usally inherits it and then it can find things properly!

[ngkong]

finally, problem solved!

<?php
system ("PATH=\$PATH:/usr/local/bin/");
system ("convert 'abcde.pdf[0]' 'abcde.jpg' 2>&1");
?>

i cant fine a way to set the path permanently. so i think setting the path each time the php file is executed is ok, because variable will be reseted each time the php file execution done...

thanks all you guys...

btw what '2>&1' means? why adding this command will cause echoing the report?

[anthony]

Actually I am supprised that worked!!! The two system calls in a normal API would run two separate shells and as such the environment change in first sub-shell in not in the second. Usally the API itself provides methods to set environment variables within the API itself and not just in the sub-shell. That way the environment will be inherited from the parent API to the child sub-shell run commands.

I suggest you refer to a good PHP tutoral book on correct handling of PATH and other environment variables within PHP.

[ngkong]

Actually I am supprised that worked!!! The two system calls in a normal API would run two separate shells and as such the environment change in first sub-shell in not in the second. Usally the API itself provides methods to set environment variables within the API itself and not just in the sub-shell. That way the environment will be inherited from the parent API to the child sub-shell run commands.

you are absolutely right! sorry my fault.

i'm actually using:

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system("PATH=\$PATH:/usr/local/bin/ && convert 'abcde.pdf[0]' 'abcde.jpg' 2>&1");

but posted as

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<?php
system ("PATH=\$PATH:/usr/local/bin/");
system ("convert 'abcde.pdf[0]' 'abcde.jpg' 2>&1");
?>

i test those codes, not work...

[anthony]

It is probably better to find out how a PHP program can set its command execution PATH environment variable properly. That way programs such as convert and gs do not need to have it hard coded thoughtout the program.

You can fix the path in one place, at the top, and then just use the programs directly.

Perhaps bonzo, the forums PHP IM example expert can figure it out and put it up on his Rubbleweb site http://www.rubblewebs.co.uk/imagemagick/

[Bonzo]

Not quite sure what you want Anthony.

This will list all the enviromental variables:

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<?php
echo"<pre>";
echo $HTTP_ENV_VARS['PATH'];
echo"</pre>";
?>

My path is listed as: [PATH] => /bin:/usr/bin

To just put the /usr/bin into a variable and use that with the convert:

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<?php
$env_vars = explode( ':', $HTTP_ENV_VARS['PATH']);
$path = $env_vars[1]."/convert";
?>

This sets the $path variable to: /usr/bin/convert

This can be used as ?:

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<?php
$env_vars = explode( ':', $HTTP_ENV_VARS['PATH']);
$env_path = $env_vars[1]."/convert";

system ("PATH=$PATH:$env_path");
?>

Or would you us it like:

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<?php
$env_vars = explode( ':', $HTTP_ENV_VARS['PATH']);
$env_path = $env_vars[1]."/convert";

exec("$env_path image.jpg -resize 100x100 output.jpg");
?>

But where would GS get its path?

[ngkong]

i think the simplest way to solve gs path problem is create file links for gs (and convert) execution files in the php execution PATH directory...
have not tried, but it should work..

[anthony]

What I mean is that their must be some way to set the PATH environment variable within the current PHP script, so that all system and exec calls will use that environment variable, It is after all how environment variables are suposed to be used. Setting or modifying the current (PHP script) environment!!!

I am not a PHP programmer, but I am sure it is quite posible. I figured you would know.