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@ 2014-06-15T14:19:33Z

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

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

45.13 ms | 402 KiB | 5 Q