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@ 2014-10-21T09:03:19Z

<?php
$input = array(
  array(
    'username' => 'matt'
  ),
  array(
    'username' => 'matt'
  )
);

echo implode(', ', array_map(function ($entry) {
  return $entry['tag_name'];
}, $input));

Output
Performance
VLD
References
Branches

array_map: documentation ( source)
implode: documentation ( source)

preferences:dark modelive preview

48.93 ms | 402 KiB | 5 Q