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@ 2014-09-27T17:43:31Z

<?php
$input = array(
  array(
    'tag_name' => 'google'
  ),
  array(
    'tag_name' => 'technology'
  )
);

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

42.39 ms | 402 KiB | 5 Q