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    <p>I've written this quick and dirty workaround:</p> <pre><code>&lt;?php class Thumb{ const GM_PATH = 'C:\\Archivos de programa\\GraphicsMagick-1.3.12-Q16\\gm.exe'; /** * Quote full command if required by server (program + arguments) */ private static function quoteFullCommand($command){ // Test only once per script static $extra_quotes_required=NULL; if( is_null($extra_quotes_required) ){ if(PHP_OS=='WINNT'){ // This call will be correct (0) if and only if the server requires extra quotes exec('""sort" /?"', $output, $return); $extra_quotes_required = $return==0; }else{ $extra_quotes_required = FALSE; } } if($extra_quotes_required){ $command = '"' . $command . '"'; } return $command; } /** * Return output from "gm version" */ public static function graphicsMagickVersion(){ $command = escapeshellarg(self::GM_PATH) . ' version '; $command = self::quoteFullCommand($command); exec($command, $output, $return); return trim(implode(PHP_EOL, $output)); } } </code></pre> <p>However, it'd be way better to predict it from PHP version or server OS so links to documentation or further tips are welcome.</p> <p><strong>Update:</strong> I've had a look at the piece of PHP source code that takes care of running external commands in Windows:</p> <p><a href="http://svn.php.net/viewvc/php/php-src/trunk/TSRM/tsrm_win32.c" rel="nofollow">http://svn.php.net/viewvc/php/php-src/trunk/TSRM/tsrm_win32.c</a></p> <p>The following line adds the extra comas to the full command:</p> <pre><code>sprintf(cmd, "%s /c \"%s\"", TWG(comspec), command); </code></pre> <p>According to the file history, that line was first added on 29th May 2008 (<a href="http://svn.php.net/viewvc?view=revision&amp;revision=260429" rel="nofollow">r260429</a>):</p> <blockquote> <p>MFH: Fix bug when command is quoted and parameters are quoted during call to exec, the result is that cmd.exe /c strips the first and last quote.</p> </blockquote> <p>The following PHP releases were 5.3.0 and 5.2.7 but the line is in the 5_3 branch and not in the 5_2 one. I'm not familiar enough with PHP development process so I can't find the changelog or tell out to which exact PHP releases the fix was ported to but I'd dare say that it was a bug in PHP and it was fixed in PHP/5.3.0 (yet it wasn't backported to 5.2 so they didn't break legacy stuff).</p> <p>So my workaround is probably overkill. You just need to test the PHP OS and version:</p> <pre><code>if( PHP_OS=='WINNT' &amp;&amp; version_compare(PHP_VERSION, '5.3.0', '&lt;') ){ $command = $command = '"' . $command . '"'; } </code></pre>
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