<?php $input = Array ( '2014-07-03' => Array ( 'results' => 0, 'clicks' => 0, 'contacted' => 0 ), '2014-07-02' => Array ( 'results' => 12, 'clicks' => 5, 'contacted' => 1 ) ) ); echo implode(', ', array_map(function ($entry) { return $entry['tag_name']; }, $input));
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