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<?php $array = array("2011-September_38","2011-June_4","2009-May_45","2010-November_9","2011-December_29","2010-March_19"); function yearCompare($a, $b) { $yeara = strtolower(substr($a,0,4)); $yearb = strtolower(substr($b,0,4)); $year = range(2008,2100); $year = array_flip($year); if($yeara == $yearb) return 0; if(!isset($year[$yeara]) || !isset($year[$yearb])) return $yeara > $yearb; return ($year[$yeara] > $year[$yearb]) ? 1 : -1; } function monthCompare($a, $b) { $count = substr($a,strpos($a,'_')); $count =strlen($count); $count1 = substr($b,strpos($b,'_')); $count1 =strlen($count1); $montha = strtolower(substr($a,5,-$count)); $maonthb = strtolower(substr($b,5,-$count1)); $months = array( 'january'=> 1, 'february'=> 2, 'march'=>3, 'april'=>4, 'may'=>5, 'june'=>6, 'july'=>7, 'august'=>8, 'september'=>9, 'october'=>10, 'november'=>11, 'december'=>12 ); if($montha == $monthb) return 0; if(!isset($months[$montha]) || !isset($months[$monthb])) return $montha > $monthb; return ($months[$montha] > $months[$monthb]) ? 1 : -1; } usort($array, "yearCompare"); //usort($array, "monthCompare"); foreach($array as $sorter) { echo $sorter."\n"; } ?>
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