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@ 2020-04-17T13:26:30Z

<?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);

Output
Performance
VLD
References
Branches

abs: documentation ( source)
print_r: documentation ( source)
ksort: documentation ( source)

preferences:dark modelive previewkey bindings

98.97 ms | 1603 KiB | 5 Q