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Message-ID: <36040878.qUTcmyb4oS@PointedEars.de>
From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Reply-To: Thomas 'PointedEars' Lahn <php@PointedEars.de>
Organization: PointedEars Software (PES)
Date: Thu, 16 May 2013 05:00:30 +0200
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Subject: Re: bug in  is_numeric
Newsgroups: comp.lang.php
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Christoph Becker wrote:

> Thomas Mlynarczyk wrote:
>> Christoph Becker schrieb:
>>> ACK.  However, the usefulness of is_numeric() returning true for strings
>>> in binary notation is somewhat doubtful, as there is no simple way to
>>> actually convert such strings to a number:
>>>
>>>   >>> (int) '0b1010'
>>>   0
>>>   >>> intval('0b1010')
>>>   0
>>>   >>> intval('0b1010', 2)
>>>   0
>>>   >>> 0 + '0b1010'
>>>   0
>> 
>> bindec( '0b1010' )
> 
> Nice -- thanks for pointing it out. :)

ACK.

> But what's that:
> 
> php -r "var_dump(bindec('foo1010bar'));"
> int(10)
> 
> It seems bindec() ignores any leading and trailing characters that are
> neither 0 or 1.
> 
> So, bindec() doesn't seem to be useful for a routine, which would
                                                      ^
> convert an arbitrary numeric string to an integer.

True.  But, on the other hand, it is not supposed to.


PointedEars
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