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Bug #80155 basename("/tmp","tmp") fails
Submitted: 2020-09-27 11:43 UTC Modified: 2020-09-27 12:44 UTC
From: divinity76 at gmail dot com Assigned:
Status: Not a bug Package: *Directory/Filesystem functions
PHP Version: 7.4.10 OS: both Windows and Linux
Private report: No CVE-ID: None
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 [2020-09-27 11:43 UTC] divinity76 at gmail dot com 
Description:
------------
running basename("/tmp","tmp") fails to remove the "tmp" suffix from the end of the name. 

tested on PHP 8.0.0 beta3 running on Linux, and PHP 7.3.7 running on Windows 10.

Test script:
---------------
<?php
var_dump(basename("/tmp","mp"));
var_dump(basename("/tmp","tmp"));


Expected result:
----------------
string(1) "t"
string(0) ""


Actual result:
--------------
string(1) "t"
string(3) "tmp"

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 [2020-09-27 12:43 UTC] sjon@php.net
-Status: Open +Status: Verified
 [2020-09-27 12:43 UTC] sjon@php.net 
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to report
a bug at http://bugs.php.net/how-to-report.php

while unexpected - this behavior matches what GNU's basename returns, see:

$ basename /tmp mp
t
$ basename /tmp tmp
tmp

I assume this is because once the entire pathname is removed, it would no longer be a suffix
 [2020-09-27 12:44 UTC] sjon@php.net
-Status: Verified +Status: Not a bug
 [2020-09-27 12:44 UTC] sjon@php.net 
.
 [2020-09-27 14:29 UTC] divinity76 at gmail dot com 
@ sjon@php.net
nowhere in the documentation do i see anything like "if the suffix is the whole name, it will not be cut off", perhaps it is a documentation issue then? 

wonder what the GNU basename documentation says about it, I'll take a look at that
 [2020-09-27 14:35 UTC] divinity76 at gmail dot com 
it seems the GNU basename documentation (at https://www.gnu.org/software/coreutils/manual/html_node/basename-invocation.html#basename-invocation ) doesn't say anything about what happens when the suffix matches the whole name, much like the PHP documentation
 
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