<?php $arr = Array ( Array( "2014-05-31" => "value1" ), Array ( "2014-04-17" => "value2" ), Array ( "2014-04-21" => "value 3" ) ); $res = usort($arr, function($a, $b){ $a_time = array_keys($a); $par1 = strtotime($a_time[0]); $b_time = array_keys($b); $par2 = strtotime($b_time[0]); if ($par1 == $par2) { return 0; } return ($par1 < $par2) ? -1 : 1; }); print_r($arr); ?>
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