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Doc Bug #69339 realpath(false) returns CWD
Submitted: 2015-03-31 09:04 UTC Modified: 2018-10-06 11:57 UTC
Votes:1
Avg. Score:4.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:1 (100.0%)
Same OS:1 (100.0%)
From: sebastian@php.net Assigned: cmb (profile)
Status: Closed Package: Filesystem function related
PHP Version: 5.6.7 OS: Linux
Private report: No CVE-ID: None
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 [2015-03-31 09:04 UTC] sebastian@php.net 
Description:
------------
realpath(false) returns the CWD. This is the behavior that the manual describes for blank or NULL values: "Whilst a path must be supplied, the value can be blank or NULL In these cases, the value is interpreted as the current directory."

Either this is a bug in PHP or the documented needs to be amended.



Test script:
---------------
<?php
var_dump(realpath(false));
var_dump(realpath(true));
var_dump(realpath(0));
var_dump(realpath(null));
var_dump(realpath(''));


Expected result:
----------------
bool(false)
bool(false)
bool(false)
string(8) "/home/sb"
string(8) "/home/sb"


Actual result:
--------------
string(8) "/home/sb"
bool(false)
bool(false)
string(8) "/home/sb"
string(8) "/home/sb"

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AllCommentsChangesGit/SVN commitsRelated reports
 [2015-03-31 10:52 UTC] cmb@php.net 
Having a look at the implementation of realpath[1], there is
nothing special with the arguments '' or NULL happening. Actually,
realpath expects a string, so other argument types will be juggled
to string, and an empty string is treated as relative path.

That's seems to be pretty fine, so I'm changing to "Documentation
Problem". However, I'm not sure that it makes sense to document
special cases such as NULL and FALSE(or even
simplexml_load_string('<foo></foo>')).

[1] <http://lxr.php.net/xref/PHP_5_6/ext/standard/file.c#2306>
 [2015-03-31 10:53 UTC] cmb@php.net
-Type: Bug +Type: Documentation Problem
 [2018-10-06 11:56 UTC] cmb@php.net 
Automatic comment from SVN on behalf of cmb
Revision: http://svn.php.net/viewvc/?view=revision&amp;revision=345785
Log: Fix #69339: realpath(false) returns CWD

There is nothing special with realpath() regarding type juggling,
so there's no need to mention that NULL can be passed instead of
an empty string.  That even wouldn't work for strict_types.
 [2018-10-06 11:57 UTC] cmb@php.net
-Status: Open +Status: Closed -Assigned To: +Assigned To: cmb
 [2018-10-06 11:57 UTC] cmb@php.net 
This bug has been fixed in the documentation's XML sources. Since the
online and downloadable versions of the documentation need some time
to get updated, we would like to ask you to be a bit patient.

Thank you for the report, and for helping us make our documentation better.
 [2020-02-07 06:05 UTC] phpdocbot@php.net 
Automatic comment on behalf of cmb
Revision: http://git.php.net/?p=doc/en.git;a=commit;h=b82236707bd00f096d557cd6f33e13bfccb97ea0
Log: Fix #69339: realpath(false) returns CWD
 
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