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Date: Wed, 23 Nov 2011 01:26:46 -0800
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To: Lester Caine <lester@lsces.co.uk>
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Subject: Re: [PHP-DEV] 5.4 regression: non-existent sub-sub keys now have
 values
From: smalyshev@sugarcrm.com (Stas Malyshev)

Hi!

On 11/23/11 12:56 AM, Lester Caine wrote:
>
> I'm having a lot of trouble with working out WHAT is going on here at all.

It's actually very simple. Take variable $a which is a string ("foo"). 
Now it you do $a[0] that would produce first letter - "f". Now here's a 
tricky part - if you do $a['blah'] it would convert 'blah' to number, 
get 0 and return the same letter "f".
Now what happens if you do $a[0][0]? Since $a[0] is "f", $a[0][0] should 
be first letter of "f" which is "f" again, right? Only in 5.3 it did not 
work because of some deficiencies in implementation of string offsets. 
In 5.4 it was fixed.
Now the situation in the bug - what happens if we do 
$a['blah']['foobar']? As we noted before, it's the same as $a[0][0] and 
thus produces "f" in 5.4. In 5.3 it didn't work because of the above 
deficiency. That's it.

-- 
Stanislav Malyshev, Software Architect
SugarCRM: http://www.sugarcrm.com/
(408)454-6900 ext. 227