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@ 2014-04-17T20:02:01Z

<?php
$input = array(
  'aaa' => array(
    'tag_name' => 'google',
    'google2'      
  ),
  'bbb' => array(
    'tag_name' => 'technology',
    'technology2'
  )
);

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

41.72 ms | 402 KiB | 5 Q