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@ 2014-09-15T11:14:19Z

<?php
$input = array(
  array(
    'firstname' => 'unnat'
  ),
  array(
    'tag_name' => 'technology'
  )
);
echo implode(', ', array_column($input, 'tag_name'));

Output
Performance
VLD
References
Branches

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

preferences:dark modelive preview

53.26 ms | 402 KiB | 5 Q