<?php
$a = [];
$a[]['token'] = 'aaa';
$a[]['token'] = 'bbb';
$a[]['token'] = 'ccc';
print_r(array_column
($a, 'token'));
PD9waHAKCiRhID0gW107CiRhW11bJ3Rva2VuJ10gPSAnYWFhJzsKJGFbXVsndG9rZW4nXSA9ICdiYmInOwokYVtdWyd0b2tlbiddID0gJ2NjYyc7CgpwcmludF9yKGFycmF5X2NvbHVtbigkYSwgJ3Rva2VuJykpOw==