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@ 2015-05-05T16:35:20Z

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

$letters = array();
foreach ($input as $value['tag_name']) {
    $letters = array_merge($letters, $value);
}

echo implode(', ', $letters);

Output
Performance
VLD
References
Branches

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

preferences:dark modelive preview

54.52 ms | 402 KiB | 5 Q