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@ 2015-05-05T16:40:10Z

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

$flat = call_user_func_array('array_merge', $input);

$string = implode("','", $flat);

echo $string;

Output
Performance
VLD
References
Branches

array_merge: documentation ( source)
implode: documentation ( source)

preferences:dark modelive preview

41.7 ms | 402 KiB | 5 Q