Online PHP editor | refs for j1aPi

<?php $meta = [ 'stationFrom' => 'Antwerpen', 'stationTo' => 'London', 'places' => [1, 3, 4], ]; $formattedMeta = [ 'stationFrom' => 'Antwerpen', 'stationTo' => 'London', 'places' => function($meta) { return implode(',', $meta['places']); } ]; var_dump($formattedMeta['places']($meta), $formattedMeta['places']); echo json_encode($formattedMeta);