php - How do I merge two associative arrays such that key collisions result in an array of both values? -

i have 2 or more array same key, want merge these arrays keep value. exp:

    $arr1 = array("message" => "message 1");     $arr2 = array("message" => "message 2");     echo "<pre>";     print_r($arr3 = somefunction($arr2,$arr1));     echo "</pre>"; 

i want result this:

array (      [message] => array           (                 [0] => message 1                 [1] => message 2           ) ) 

array_merge_recursive() : merges elements of 1 or more arrays values of 1 appended end of previous one. returns resulting array.

example :

<?php $arr1 = array("message" => "message 1"); $arr2 = array("message" => "message 2"); echo "<pre>"; print_r($arr3 = array_merge_recursive($arr2,$arr1)); echo "</pre>"; ?> 

output :

array (     [message] => array         (             [0] => message 2             [1] => message 1         )  ) 

more info : http://php.net/manual/en/function.array-merge-recursive.php