<?php $array = array( 'A4' => array(), 'B10' => array(), 'D3' => array(), 'A20' => array(), 'A3' => array(), 'D22' => array(), 'D1' => array(), 'C2' => array(), 'B3' => array(), 'A1' => array(), 'B2' => array(), 'C11' => array(), ); ksort($array, SORT_NATURAL); echo implode(', ', array_keys($array)), PHP_EOL;
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