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@ 2017-06-25T02:49:27Z

<?php

$a = [-59.33, -58.22, -57.00, -55.34, -50.00, -45.94, -40.23, -30.44, -20.01, -10.29, -5.12, 0, 1, 3, 5, 7, 19, 20,25,26, 32, 38, 40, 45, 50, 55];

$b = -25;

$c = array_map(function($value) use($b){
    return abs(bcsub($value, $b, 2));
}, $a);

sort($c);

echo $c[0]+$b;
echo "\n";
echo $c[1]+$b;

Output
Performance
VLD
References
Branches

array_map: documentation ( source)
abs: documentation ( source)
sort: documentation ( source)

preferences:dark modelive preview

55.71 ms | 402 KiB | 5 Q