realpath returns empty string

Question

I use MediaWiki but there is an error. I found it in the files. There is line with this code:

$IP = realpath( '.' );

But $IP returns an empty string, so the path to the files in the system is not working. (for example if $IP would be . or E:/path_to_wwwroot it works). How can I solve the problem. Is it possible that my provider blocked access to realpath?

Thanks!

Do you get any joy with `./`? Shouldn't make a difference but might be worth a shot... — DaveRandom, Oct 26 '11 at 17:34
No:-( $IP is still empty. But for example basename works. But I don't use it, I want to know why I get this error. There might be more errors with realpath:-( — Jordy, Oct 26 '11 at 17:38
and also `realpath()` does not work on files that do not exist. — Thamaraiselvam, Apr 21 '16 at 12:25

score 18 · Accepted Answer · edited Oct 26 '11 at 17:57

18

Source: http://php.net/manual/en/function.realpath.php

Note: The running script must have executable permissions on all directories in the hierarchy, otherwise realpath() will return FALSE.

So your web server should have access also to pre-webroot directories.

edited Oct 26 '11 at 17:57

DaveRandom

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answered Oct 26 '11 at 17:37

Alexey Morozov

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Ah thanks, It needs read permissions on all directory in the wwwroot? Or also the files outside the wwwroot? – Jordy Oct 26 '11 at 17:39
Wow, it solved the problem! Many thanks. I needed to change the read permission from my subdomain map. Thanks!!! – Jordy Oct 26 '11 at 17:40
I ran into this when I was running the "portable" PHP+NGINX app WT-NMP and my sandboxed PHP app was referencing libraries outside the path I specified for open_basedir in php.ini. I solved it by also adding my library path to open_basedir (using the ";" delimiter on Windows). – ftexperts Mar 25 '14 at 04:28
realpath on a file that does not exist also returns a blank – Graham Feb 08 '17 at 11:47

score 1 · Answer 2 · answered Jan 14 '16 at 15:47

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I am currently experiencing this result when running PHP from command line, but not within an HTTP request. Got to be config or $_SERVER settings somewhere, will update if I find the fix.

answered Jan 14 '16 at 15:47

siliconrockstar

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score 0 · Answer 3 · answered Apr 29 '19 at 13:08

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The path I was creating didn't exist, make always sure that it's well formed.

This is the path I was using:

realpath(MY_PATH . '../other_path');

Where MY_PATH didn't have a trailing /.

answered Apr 29 '19 at 13:08

Alberto M

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realpath returns empty string

3 Answers3