ID:          41108
 Updated by:  [EMAIL PROTECTED]
 Reported By: jack dot nerad at comcast dot net
 Status:      Verified
 Bug Type:    Documentation problem
 PHP Version: Irrelevant
 New Comment:

Looks like php 4.2.0 introduced better pow() support (the whole
function was re-done at revision 1.70 (just before 4.2.0rc1 release).


Previous Comments:
------------------------------------------------------------------------

[2007-04-18 21:32:27] [EMAIL PROTECTED]

Thank you guys for the bug report and patch, it's the right idea but
the php manual has change logs for functions.

Tasks for tackling this bug report:

- Find out exactly which PHP version(s) this behavior changed
- Add an entry to the changelog role in math/functions/pow.xml
- Add an example to these docs using a negative exponent, and 
  if appropriate add version info within the example comments
- Decide if other functions were affected by this change in the
  php sources (See also: NEWS, php-src/)
- If a 'fairly recent' change, add a nice example that works 
  in all versions
- Clean user notes

A good starting place:

- http://cvs.php.net/viewvc.cgi/php-src/ext/standard/math.c?view=log
- http://php.net/manual/en/function.pow


------------------------------------------------------------------------

[2007-04-18 20:23:24] ljbuesch at purdue dot edu

### Eclipse Workspace Patch 1.0
#P PHPDoc
Index: en/reference/math/functions/pow.xml
===================================================================
RCS file: /repository/phpdoc/en/reference/math/functions/pow.xml,v
retrieving revision 1.11
diff -u -r1.11 pow.xml
--- en/reference/math/functions/pow.xml 31 Mar 2007 19:18:23
-0000   1.11
+++ en/reference/math/functions/pow.xml 18 Apr 2007 20:18:37 -0000
@@ -16,11 +16,6 @@
    Returns <parameter>base</parameter> raised to the power of
    <parameter>exp</parameter>. 
   </para>
-  <note>
-   <para>
-    PHP cannot handle negative <parameter>exp</parameter>s.
-   </para>
-  </note>
   <warning>
    <para>
     In PHP 4.0.6 and earlier <function>pow</function> always returned

------------------------------------------------------------------------

[2007-04-18 06:09:11] [EMAIL PROTECTED]

Made it a doc problem, which it is. It might be that in the past this
negative exponent did not work though.

------------------------------------------------------------------------

[2007-04-18 00:36:25] jack dot nerad at comcast dot net

Now that's turnaround time!  I didn't even have to upgrade to the
latest version! :)

Actually, I was looking for how to do exponentiation in the docs, found
pow(), and read:

"Note:  PHP cannot handle negative exps."

at

http://us.php.net/manual/en/function.pow.php

 
There's pretty much only one way to read that, I think, so I didn't
bother to look for features explicitly ruled out by the docs.  In
addition, there are a bunch of notes with hacks on how to get around the
no negative exponents 'feature?'

(shrug) 

Close this feature request, or whatever. Maybe change it to a bug in
the docs?

------------------------------------------------------------------------

[2007-04-17 08:27:42] [EMAIL PROTECTED]

What are you talking about?

# php -r 'var_dump(pow(2,-2));'
float(0.25)


------------------------------------------------------------------------

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the rest of the comments, please view the bug report online at
    http://bugs.php.net/41108

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Edit this bug report at http://bugs.php.net/?id=41108&edit=1

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