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@ 2015-04-25T15:00:40Z

<?php
$letters = array(
  array(
    '1' => '2',
    '2' => '3'
  ),
  array(
    '1' => '3',
    '2' => '2'
  )
);


foreach ($array as $value) {
    $letters = array_merge($letters, $value);
}

echo implode(', ', $letters);

Output
Performance
VLD
References
Branches

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

preferences:dark modelive preview

55.19 ms | 402 KiB | 5 Q