<?php $array = array(array('date'=>'2014-12-01', 'price'=>'123.00'), array('date'=>'2013-12-01', 'price'=>'123.00'), array('date'=>'2014-02-01', 'price'=>'123.00'), array('date'=>'2014-03-01', 'price'=>'123.00')); var_dump($array); function date_compare($a, $b) { $t1 = strtotime($a[$key]); $t2 = strtotime($b[$key]); return $t1 - $t2; } usort($array, 'date_compare')); var_dump($array);
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