Hackerrank challenge - plusMinus - https://www.hackerrank.com/challenges/plus-minus/problem

plusMinus.php

function plusMinus($arr) {
    $arrLen = count($arr);
    $posi = count(array_filter($arr, "countPosi"));
    $nega = count(array_filter($arr, "countNega"));
    $zero = count(array_filter($arr, "countZero"));

    $ratioPosi = $posi / $arrLen;
    $ratioNega = $nega / $arrLen;
    $ratioZero = $zero / $arrLen;
    
    echo abs(number_format($ratioPosi, 6, '.', '' )) ."\n";
    echo abs(number_format($ratioNega, 6, '.', '' )) ."\n";
    echo abs(number_format($ratioZero, 6, '.', '' )) ."\n";
}

function countPosi($val) {return $val > 0;}
function countNega($val) {return $val < 0;}
function countZero($val) {return $val === 0;}