array_unique for arrays inside array

Question

I need a function like array_unique for arrays inside array.

The Case - should be equal, but output "not equal":

<?php
$arr=array(array('a',1),array('a',2));
$arr2=array_unique($arr);
if($arr2==$arr){
  echo "equal";
}
else{
  echo "not equal";
}
?>

How should the code be changed to get output "equal"?

Man, this always comes up. Read the manual, it says "Note that array_unique() is not intended to work on multi dimensional arrays." — BoltClock
– BoltClock, Commented Mar 6, 2011 at 17:00
I don't understand what you mean by "Hi, like array_unique for arrays inside array." — BoltClock
– BoltClock, Commented Mar 6, 2011 at 17:31

user142162 · Accepted Answer · 2011-03-06 17:09:14Z

54

You should modify your call for array_unique to have it include the SORT_REGULAR flag.

$arr2 = array_unique($arr, SORT_REGULAR);

answered Mar 6, 2011 at 17:09

user142162

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Comments

mario · Accepted Answer · 2011-03-06 17:10:45Z

2

If you want to test if the outer array has unique entries, then stringify the inner contents first for a comparison:

$arr1 = array_map("serialize", $arr);
$arr2 = array_unique($arr1);
if ($arr2 == $arr1) {

answered Mar 6, 2011 at 17:10

mario

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Comments

Hussein Harake · Accepted Answer · 2015-04-03 19:31:27Z

-1

function array_unique_when_values_are_serializable($main_array) {
    return array_map('unserialize', array_values(array_unique(array_map('serialize', $main_array))));
}

answered Apr 3, 2015 at 19:31

Hussein Harake

1

1 Comment

Machavity Over a year ago

Please explain your answer. SO exists to teach users, not just answer questions.

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