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@ 2014-10-19T12:05:55Z

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

$cols = implode(', ',array_keys($input));

echo $cols;

Output
Performance
VLD
References
Branches

implode: documentation ( source)
array_keys: documentation ( source)

preferences:dark modelive preview

35.7 ms | 402 KiB | 5 Q