Array comparison problem

[Jaswinder]

Hi

i am trying to compare to arrays

 

$a = Array ( [q1] => no [q3] => yes [q2] => yes );

$b = Array ( [q1] => no [q3] => yes [q2] => yes );

 

But when i intersect them it results in one element only, dont know why???

 

$c = array_intersect($a,$b);

print_r($c);

 

output -

 

Array ( [q1] => no )

[bsmither]

Allow me to start by asking if intended for the array values to be constants?

 

Please perform an experiment where the keys and values are quoted, and the elements are properly separated by commas, and that you are properly declaring $a and $b as array().

 

I gather what you have posted above is a plain-text approximation of what the arrays contain - not syntactically correct PHP statements.

Edited May 26, 2014 by bsmither

[Philip]

It should be outputting all 3.

<pre>
<?php
$a = ['q1' => 'no', 'q3' => 'yes', 'q2' => 'yes'];
$b = ['q1' => 'no', 'q3' => 'yes', 'q2' => 'yes'];

print_r(array_intersect($a, $b));

Returns:

Array
(
    [q1] => no
    [q3] => yes
    [q2] => yes
)

Can you post your actual code?

[bsmither]

My experiment confirms Philip.

 

I am running PHP 5.3.5.

[Barand]

If you just want to know if the keys and values are the same a simple equality check will do it

$a = array('q1' => 'no', 'q3' => 'yes', 'q2' => 'yes');
$b = array('q1' => 'no', 'q2' => 'yes', 'q3' => 'yes');

echo $a == $b ? "Arrays are the same" : "Arrays are different";

[Jaswinder]

Hi thanks for reply guys, nothing helping,

I explain you what i am doing

 

I entered some questions in database with answer  yes    or   no

 

After that  i asked the same question from visitors and get their answer also .., then i compared them ,

 

Now in the same example , if i take some numeric values, instead of yes/no, the functions results correct i.e returning all the same values.

 

i think character comparison is giving problem ? isn't it ?

[Jaswinder]

Any further help ?

[mac_gyver]

use var_dump() on your two arrays being compared, that would help show things like white-space in with the data.

[Jaswinder]

i tried var_dump() , and i found  some problem

 

array(3) { ["q1"]=> string(2) "no" ["q2"]=> string(10) " yes" ["q3"]=> string(10) " yes" }

array(3) { ["q1"]=> string(2) "no" ["q2"]=> string(3) "yes" ["q3"]=> string(3) "yes" }

 

After array_intersect()

array(1) { ["q1"]=> string(2) "no" }

 

Why it showing string(10), there is only 3

 

I think there is something messy in the value of input field

Edited May 28, 2014 by Jaswinder

[Jaswinder]

Hey thanks guys , i found why its coming, there were spaces in the value of my input fields and this is the most silly mistake i ever done.

Edited May 28, 2014 by Jaswinder