PHP array unique does not work like expected [duplicate]

Question

I have a problem with array_unique() in PHP. Here is my code:

$filterGroupsArray = ['', 'a', 'a', 'b'];
print_r($filterGroupsArray);
array_unique($filterGroupsArray);
print_r($filterGroupsArray);

The output is

Array ( [0] => [1] => a [2] => a [3] => b ) Array ( [0] => [1] => a [2] => a [3] => b )

but I am expecting

Array ( [0] => [1] => a [2] => a [3] => b ) Array ( [0] => [1] => a [2] => b )

What did I do wrong? Thank you very much!

Liftoff · Accepted Answer · 2021-07-07 06:19:48Z

0

array_unique returns a new array with the duplicate values removed.

$uniqueArray = array_unique($filterGroupsArray);
print_r($uniqueArray);

answered Jul 7, 2021 at 6:19

Liftoff

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