Check array indexes

[NotionCommotion]

Given either $arr1a or $arr1b, what is the best way to confirm that $arr2 has only the three indexes a, b, and c?

$arr1a=['a','b','c'];
$arr1b=['a'=>null,'b'=>null,'c'=>null];

$arr2=['a'=>1,'b'=>0,'c'=>0];

[cyberRobot]

Have you tried array_diff_key() with $arr1b? If the return value is empty, the keys are good.

http://php.net/manual/en/function.array-diff-key.php

 

With $arr1a, you would probably need to use array_keys() on $arr2. And then compare the return value to $arr1a.

http://php.net/manual/en/function.array-keys.php

[NotionCommotion]

Thanks CyberRobot.

 

A requirement is has only the three indexes, and a single array_diff_key() will not work.  I could then use a second array_diff_key() or compare the count, but expect one of the other countless array functions might be more suitable.

var_dump(array_diff_key(['a'=>null,'b'=>null,'c'=>null], ['a'=>1,'b'=>0,'c'=>2]));
//array(0) { }


var_dump(array_diff_key(['a'=>null,'b'=>null], ['a'=>1,'b'=>0,'c'=>2]));
//array(0) { }


var_dump(array_diff_key(['a'=>null,'b'=>null,'c'=>null], ['a'=>1,'b'=>0]));
//array(1) { ["c"]=> NULL } 

[Barand]

Perhaps check that (pseudocode)

count(array_intersect_key) == 3 AND array_diff_key is empty

[NotionCommotion]

Thanks Barand,  Yes, that would work, and is what I meant by comparing the counts.  Still seems there would be a better way.

[benanamen]

Still seems there would be a better way.

 

Where is the data coming from?

[NotionCommotion]

Where is the data coming from?

 

I receive JSON data via a socket.  Certain data is expected based on the database.  I wish to confirm that the JSON is not providing more or less data that is expected.  I can easily enough do the array_diff_key along with confirm index counts are equal solution, but just felt there was a really slick way which would be a good thing to learn.

[benanamen]

That is a lot more useful info than how to handle your attempt at it. Not sure if it is, but it was smelling of an XY Problem to me.

 

Are you able to provide details on the "Certain Data" and exactly what it means regarding more or less data? Any other details may also be helpful. Are you in control of the source data? If not, what are your options in retrieving it? Are we talking about a third party API? 

 

 

Edit* Is this a third thread regarding the same project as your other two threads?

 

https://forums.phpfreaks.com/topic/302727-multiple-updates/page-2

 

https://forums.phpfreaks.com/topic/302752-insert-on-duplicate-key-update-with-composite-key/

Edited December 15, 2016 by benanamen