Re: A little confusing thing on (mistakenly) geting a offset from string with multi dim index.

Thank you Mike. I post this thread just because I surprised by this behavior (Not because I got problem on it, so there is no real world example, just the test itself). In simple say, I don't think the conversion is good idea. I mean, if isset($string['check']) and isset($string['check'][0]) can be both false, that will be better for understanding. (So I post my complain and looking for chances of change) I did post in php.internals, but no response yet, maybe thats because my english too poor to explain this clearly or guys inside php think that is fine. isset($string['check'], $string['check'][0]) is good, I will use it when I need. ""Ford, Mike"" news:3158105795AAC1408619EC8BA03384A93CFF73E8@EXC-PUB01A.leedsmet.ac.uk... > -----Original Message----- > From: Rain Lee [mailto:root@3ax.org] > Sent: 15 May 2014 01:55 > To: Jim Lucas > Cc: php-general@lists.php.net > Subject: Re: [PHP] A little confusing thing on (mistakenly) geting a > offset from string with multi dim index. > > So, here is the TLDR; > > $string = 'this is a string'; > > In PHP 5.5 > isset($string['check']) === false Yes, because isset is specifically defined (nowadays) to reject string Offsets on a string. > isset($string['check'][0]) === true This is correct because the isset is only checking the final index - it's not doing any checks on 'check', so the normal PHP rules of string->integer conversion apply, and you get a zero. (If you don't know what the "normal rules" are, see http://ow.ly/wT2t0). So, $string['check'] is effectively $string[0], which is "t"; so $string['check'][0] is $string[0][0], which is set and evaluates to "t". To check that all the indexes work, you will need to do if (isset($string['check']) && isset($string['check'][0])) Or even if (isset($string['check'], $string['check'][0])) which has the same effect.