- abs: documentation ( source)
- uasort: documentation ( source)
- print_r: documentation ( source)
<?php
$arr = [
1,3,1,8,9,7,2,0,-1,6,4
];
print_r($arr);
uasort($arr, function($a, $b){
return abs(3-$a) - abs(3-$b);
});
print_r($arr);