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<?php $a = array(99, 95, 101, 102, 103, 98, 97, 110); $number = 100; $diff = []; foreach($a as $ele){ $diff[abs($number - $ele)][] = $ele; } ksort($diff,SORT_NUMERIC); print_r($diff);

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26.3 ms | 406 KiB | 5 Q