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php-general | 2005051

Re: [PHP] array diff with both values returned From: Philip Hallstrom (php <email protected>)
Date: 05/06/05

> Is there a good way to get the difference in two arrays and have both
> values returned? I know I can use array_dif to see what is in one and
> not the other but...I need it to work a bit differently.
>
> I have:
>
> $array1=array("name"=>"fred","gender"=>"m","phone="=>"555-5555");
> $array2=array("name"=>"fred","gender"=>"f","phone="=>"555-5555");
>
> I want to compare these two and have it return:
>
> array("gender"=>array("m","f"));
>
> I want it to return all of the differences with the key and then the
> value from array 1 and 2.

Well, if you can gaurantee that for every key will exist in both arrays,
the following will work:

<?php

$array1=array("name"=>"fred","gender"=>"m","phone="=>"555-5555");
$array2=array("name"=>"fred","gender"=>"f","phone="=>"555-5555");

$array3 = fooFunc($array1, $array2);
print_r($array3);

function fooFunc(&$array1, &$array2) {
         foreach ( $array1 as $k1 => $v1 ) {
                 $v2 = $array2[$k1];
                 if ( $v1 != $v2 ) {
                         $result_ary[$k1] = array($v1, $v2);
                 }
         }

         return($result_ary);
}

?>

Prints out:

% php foo.php
Array
(
     [gender] => Array
         (
             [0] => m
             [1] => f
         )

)

Depending on how large of an array you're expecting back, you might want
to pass that around as a reference as well to save a copy... or not...

-philip 

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