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@ 2013-07-18T08:06:30Z

<?php

$meta = [
	'stationFrom' => 'Antwerpen',
    'stationTo' => 'London',
    'places' => [1, 3, 4],
];

$formattedMeta = [
	'stationFrom' => 'Antwerpen',
    'stationTo' => 'London',
    'places' => function() {
		return implode(',', $meta['places']);
    }
];

echo json_encode($formattedMeta);

Output
Performance
VLD
References
Branches

implode: documentation ( source)
json_encode: documentation ( source)

preferences:dark modelive preview

49.15 ms | 402 KiB | 5 Q