Online PHP editor | refs for AVdJb

<?php $array = [ 495 => (object)['date' => '2009-10-31 18:24:09'], 582 => (object)['date' => '2010-2-11 12:01:42'], 121 => (object)['date' => '2008-12-1 18:24:09'], 333 => (object)['date' => '2019-9-9 15:15:15'], 987 => (object)['date' => '2009-2-20 6:06:33'], ]; uasort( $array, function($a, $b) { echo "compare\n"; return strtotime($a->date) <=> strtotime($b->date); } ); var_export($array); echo "\n---\n"; $array = [ 495 => (object)['date' => '2009-10-31 18:24:09'], 582 => (object)['date' => '2010-2-11 12:01:42'], 121 => (object)['date' => '2008-12-1 18:24:09'], 333 => (object)['date' => '2019-9-9 15:15:15'], 987 => (object)['date' => '2009-2-20 6:06:33'], ]; $dates = array_map('strtotime', array_column($array, 'date')); array_multisort($dates, $array); var_export($array);