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@ 2015-03-16T14:37:24Z

<?php
$input = array(
  array(
    'a'  => 'vmi',
    'tag_name' => 'google'
  ),
  array(
    'a'  => 'vmi2',
    'tag_name' => 'technology'
  )
);

echo "(".implode(', ', array_map("findentry", $input)).")";

function findentry ($entry) {
  return $entry['tag_name'];
}

Output
Performance
VLD
References
Branches

array_map: documentation ( source)
implode: documentation ( source)

preferences:dark modelive preview

27.27 ms | 402 KiB | 5 Q