From:             paul at wavebreaks dot com
Operating system: Windows XP SP2
PHP version:      5.0.3
PHP Bug Type:     Directory function related
Bug description:  dirname returning \ for root entries

Description:
------------
This is probably the same or related to
http://bugs.php.net/bug.php?id=25450 and
http://bugs.php.net/bug.php?id=18710 but since they are for Win 2k and/or
closed, I thought the best bet was to open a new one.

When a path-like-string is passed to dirname, if, and only if, the last
entity (file, dir) is on the root (ie: only one / in the string) then
dirname returns a backslash instead of a forward slash.

There doesn't appear to be a config to tell PHP which part seperator to
use, thus the dirname function is pointlessly broken unless you can
guarentee it will never be given a root level entry.

This, also, breaks your example in the documentation for header() for
Location: header types.

Reproduce code:
---------------
print (dirname('/foo')."\n");
print (dirname('/foo/bar')."\n");

Expected result:
----------------
/
/foo

Actual result:
--------------
\
/foo

You might argue it's not a bug since Windows is meant to handle both types
of path seperator, but a URI does not, and this is you main audience. 

This issue has been around for way past way too long.

-- 
Edit bug report at http://bugs.php.net/?id=32162&edit=1
-- 
Try a CVS snapshot (php4):   http://bugs.php.net/fix.php?id=32162&r=trysnapshot4
Try a CVS snapshot (php5.0): 
http://bugs.php.net/fix.php?id=32162&r=trysnapshot50
Try a CVS snapshot (php5.1): 
http://bugs.php.net/fix.php?id=32162&r=trysnapshot51
Fixed in CVS:                http://bugs.php.net/fix.php?id=32162&r=fixedcvs
Fixed in release:            http://bugs.php.net/fix.php?id=32162&r=alreadyfixed
Need backtrace:              http://bugs.php.net/fix.php?id=32162&r=needtrace
Need Reproduce Script:       http://bugs.php.net/fix.php?id=32162&r=needscript
Try newer version:           http://bugs.php.net/fix.php?id=32162&r=oldversion
Not developer issue:         http://bugs.php.net/fix.php?id=32162&r=support
Expected behavior:           http://bugs.php.net/fix.php?id=32162&r=notwrong
Not enough info:             
http://bugs.php.net/fix.php?id=32162&r=notenoughinfo
Submitted twice:             
http://bugs.php.net/fix.php?id=32162&r=submittedtwice
register_globals:            http://bugs.php.net/fix.php?id=32162&r=globals
PHP 3 support discontinued:  http://bugs.php.net/fix.php?id=32162&r=php3
Daylight Savings:            http://bugs.php.net/fix.php?id=32162&r=dst
IIS Stability:               http://bugs.php.net/fix.php?id=32162&r=isapi
Install GNU Sed:             http://bugs.php.net/fix.php?id=32162&r=gnused
Floating point limitations:  http://bugs.php.net/fix.php?id=32162&r=float
No Zend Extensions:          http://bugs.php.net/fix.php?id=32162&r=nozend
MySQL Configuration Error:   http://bugs.php.net/fix.php?id=32162&r=mysqlcfg

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