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@ 2014-03-24T08:27:12Z

<?php

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

echo implode(', ', array_column($input, 'tag_name'));

Output
Performance
VLD
References
Branches

array_column: documentation ( source)
implode: documentation ( source)

preferences:dark modelive preview

38.39 ms | 402 KiB | 5 Q