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POPHP is_readable returns true for non-readable file
 

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  1. POPHP is_readable returns true for non-readable file
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    <p>I have an image processor PHP script, and it contains the following code:</p> <pre><code> if (!is_dir($fullFile)) { if (is_readable($fullFile)) { $im = getimagesize($fullFile); // Will be FALSE if not an image </code></pre> <p>In some instances, the script will fail at getimagesize with the following error:</p> <pre><code>getimagesize(/path/to/file.jpg) [function.getimagesize]: failed to open stream: Permission denied at www.yada.yada/page.php </code></pre> <p>In this case, the permissions for /path/to/file.jpg are definitely prohibitive (400), so I'd have expected the is_readable test to prevent me getting to that point. Aside from setting permissions differently, what might I do in order to resolve this? Why does it seem that is_readable has an incorrect result? Is it possible that is_readable is operating with the EUID of the file owner, while getimagesize is not? That's the only explanation that makes sense to me, but even that knowledge doesn't help resolve. </p> <p>Prompted by @hek2mgl I created this ultra-complex script, named readable.php:</p> <pre><code>&lt;?php echo is_readable("/stora2/Pics/2009/2009-07-26/DSC00532.JPG") . "\n\n"; ?&gt; </code></pre> <p>Then I switched user to the web server user (actually www-data on this server) and ran it. Result was</p> <pre><code>1 </code></pre> <p>Then I ran strace as that same user. These are the commands I used. The result is a 70KB+ file, and SO won't let me post it in its entirety, so it is posted at <a href="http://pastebin.com/mFqiSBiz" rel="nofollow">http://pastebin.com/mFqiSBiz</a></p> <pre><code>dennis@luke:~$ sudo su - www-data $ ls -l "/stora2/Pics/2009/2009-07-26/DSC00532.JPG" -rw------- 1 dennis dennis 524288 2012-02-11 08:18 /stora2/Pics/2009/2009-07-26/DSC00532.JPG $ file "/stora2/Pics/2009/2009-07-26/DSC00532.JPG" /stora2/Pics/2009/2009-07-26/DSC00532.JPG: writable, regular file, no read permission $ php /home/dennis/readable.php 1 $ strace php /home/dennis/readable.php &gt; /tmp/strace.out 2&gt;&amp;1 </code></pre> <p>Not sure what I'm looking for. Please advise.</p>
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    1. CO*"Keep in mind that PHP may be accessing the file as the user id that the web server runs as (often 'nobody')."*
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    2. COThe result could also be cached. Try [`clearstatcache()`](http://php.net/manual/en/function.clearstatcache.php)
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    3. COWhat user owns the file and what user is your web server running as?
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      1. USMike Brant
 

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