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@ 2014-06-18T10:32:43Z

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

echo join(',', array_map(function (array $tag) { return $tag['tag_name']; }, $array));

Output
Performance
VLD
References
Branches

array_map: documentation ( source)
join: documentation ( source)

preferences:dark modelive preview

42.75 ms | 402 KiB | 5 Q