gistfile1.txt

<?php

class Math
{

    public static function min($original)
    {
        $i = 0;
        $mi = $original[$i];
        for (; $i < count($original);) {
            if ($original[$i] < $mi) {
                $mi = $original[$i];
            }
            $i++;
        }
        return $mi;
    }

    public static function max($original)
    {
        $i = 0;
        $ma = $original[$i];
        for (; $i < count($original);) {
            if ($original[$i] > $ma) {
                $ma = $original[$i];
            }
            $i++;
        }
        return $ma;
    }

    public static function inArray($ar, $value)
    {
        for ($i = 0; $i < count($ar); $i++) {
            if ($ar[$i] == $value) {
                return true;
            }
        }

        return false;
    }

    public static function fillSpaces($original, $min)
    {
        for ($i = $min; $i < count($original); $i++) { //range
            if (!Math::inArray($original, $i)) {
                echo "$i"."</br>";
            }
        }
    }

    public static function matches($original)
    {
        $counter = 0;

        foreach ($original as &$current) {
            foreach ($original as $j => &$value) {
                if ($value == $current) {
                    unset($original[$j]);
                    $counter++;
                }
            }

            if ($counter >= 2) {
                echo sprintf('%d appears %d times',$current,$counter) ."</br>";
            }
            $counter = 0;
        }
    }

} //class


function main(){
    $test = [3, 1, -5, 3, 3, -5, 0, 10, 1, 1];
    echo sprintf("Range is %s to %s", Math::min($test), Math::max($test)) ."</br>";
    echo "Missing Numbers: </br>";
    Math::fillSpaces($test, Math::min($test));
    echo "Duplicate Numbers: </br>";
    Math::matches($test);

}
main();