Dynamic Dropdown PHP not reading array

Hi all,
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I am having difficulties loading my php array into my dropdown.
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My API call is returning the correct array in what I assume is the correct format - this is from my debugger where i have added a
$this->data('first_place',$allTeams,true); command to return the below array - my php function is called php3
​
​

[first_place] => Array
        (
            [0] => Arsenal
            [1] => Aston Villa
            [2] => Chelsea
            [3] => Everton
            [4] => Liverpool
            [5] => Man City
            [6] => Man United
            [7] => Newcastle
            [8] => Norwich
            [9] => Tottenham
            [10] => Wolverhampton
            [11] => Burnley
            [12] => Leicester City
            [13] => Southampton
            [14] => Watford
            [15] => Crystal Palace
            [16] => Sheffield Utd
            [17] => Brighton Hove
            [18] => West Ham
            [19] => Bournemouth
        )

​
In my dropdown options I have tried {var:php3} and {var:first_place} and none of them populate my dropdown. I have placed the php in front of my display_section as well.
​
What am I missing?

You really shouldn't be adding it to a data value like that. You should just return the array from your PHP block, and use {var:phpblockname} instead of using $this->data('name', $value, true)