Hi Aziz, Problem is i didn't switch that. The test i mentioned here: http://news.php.net/php.general/323297 showing this result with PHP 5.5. On Thu, May 15, 2014 at 9:07 AM, Aziz Saleh <azizsaleh@xxxxxxxxx> wrote: > > > > On Wed, May 14, 2014 at 8:55 PM, Rain Lee <root@xxxxxxx> wrote: >> >> So, here is the TLDR; >> >> $string = 'this is a string'; >> >> In PHP 5.5 >> isset($string['check']) === false >> isset($string['check'][0]) === true >> >> Why can't let >> isset($string['check']) === false >> isset($string['check'][0]) === false <-- >> >> ? >> >> On Thu, May 15, 2014 at 12:27 AM, Jim Lucas <lists@xxxxxxxxx> wrote: >> > On 05/13/2014 08:22 AM, \R\N wrote: >> >> >> >> Greeting guys, >> >> >> >> I got a problem on checking and getting a string with multi dim index >> >> (like >> >> ['blablabla']['blabla']). It confusing me, so I think I need to found >> >> an >> >> answer to clear myself. >> >> >> >> First of all, I known that is wrong to get something from a string >> >> using a >> >> multi dim index or even a string index. I did it by mistakenly set a >> >> wrong >> >> parameter. The parameter supposed to be array with string as index >> >> (That >> >> will actually be a hashmap), but I setted a string on it. >> >> >> >> As result, I got a warning raised: Illegal string offset. >> >> >> >> It's normal since I use the string as index to attempt to getting >> >> something >> >> from a string. But the strange thing is, I did the isset check before >> >> use >> >> the index. It supposed to be hot pass the check, but it did. >> >> >> >> So I made a shorter test here: >> >> >> >> >> >> https://gist.github.com/raincious/682ba152dbd74537e323#file-stringisset-php >> >> >> >> The test 1 is what I used in my application, it checks if the array >> >> index >> >> is >> >> set and not empty in same time. A valid param for it should be like >> >> this: >> >> >> >> $string = array( >> >> 'check' => 'yes', >> >> ); // Please ignore the variable name >> >> >> >> But when the $string truly turned to a string, it become the source of >> >> my >> >> question. >> >> >> >> Please notice that, on document: >> >> http://www.php.net/manual/en/function.isset.php says, "Checking >> >> non-numeric >> >> offsets of strings now returns FALSE." since 5.4, and I using 5.5. >> >> >> >> So the test 3 (isset($string['check']) one) running as expected, it >> >> returns >> >> false. However, the test1 (isset($string['check'][0]) one) is >> >> unfortunatly >> >> not, It actually returnning true. >> >> >> >> >> >> I'm not a experter of PHP and I even need other people's help to read >> >> PHP >> >> source code, but in the information from the document and the talking >> >> with >> >> other people gives me some guts to guess the $string['check'][0] >> >> actually >> >> will be converted into $string[(int)'check'][0] and then into >> >> $string[0][0], >> >> so the test 1 can be pass. Is that right? >> >> >> >> So, what I want to know is, why there has two kind of behaviour for >> >> isset? >> >> Maybe it's better to let the isset($string['check'][0]) and >> >> isset($string['check']) both return false? >> >> >> > >> > What you are describing, and what is in your test script on github is >> > extremely confusing. I'm still not sure what you think you are trying >> > to >> > accomplish with your tests. >> > >> > Can you give us a real world example of what it is you are trying to do? >> > >> > >> >> >> >> And sorry for my english, please ask if you confused by me. >> >> >> >> Thank you, >> >> R >> > >> > >> > >> > -- >> > Jim Lucas >> > >> > http://www.cmsws.com/ >> > http://www.cmsws.com/examples/ >> > >> >> -- >> PHP General Mailing List (http://www.php.net/) >> To unsubscribe, visit: http://www.php.net/unsub.php >> > > I think you switched the two: > > isset($string['check']) === true > > isset($string['check'][0]) === false > > 'check' is automatically converted to an int by PHP (since the array is > numeric) which gives you $string[0] which is set. However, if you try ding > $string[0][0] ($string['check'][0]) it will give you false since it does not > exist. > > PHP is pretty flexible when it comes to using ints as strings and vice > verse, you just need to know you are using them correctly. > > Also use var_dump() when doing checks to give you a better idea what PHP is > doing behind the scenes. > > Aziz -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
