<?php
 
class Klasemen
{
    private $poinKlub = [];
 
    public function __construct($daftarKlub)
    {
        foreach ($daftarKlub as $klub) {
            $this->poinKlub[$klub] = 0;
        }
    }
 
    public function catatPermainan($klubKandang, $klubTandang, $skor)
    {
    	if (in_array($klubKandang) && in_array($klubTandang)) {
    		exit();
    	}
 
        list($skorKandang, $skorTandang) = explode(':', $skor);
        $skorKandang = (int)$skorKandang;
        $skorTandang = (int)$skorTandang;
 
        if ($skorKandang > $skorTandang) {
            $this->poinKlub[$klubKandang] += 3;
        } elseif ($skorKandang < $skorTandang) {
            $this->poinKlub[$klubTandang] += 3;
        } else {
            $this->poinKlub[$klubKandang] += 1;
            $this->poinKlub[$klubTandang] += 1;
        }
    }
 
    public function cetakKlasemen()
    {
        arsort($this->poinKlub);
        return $this->poinKlub;
    }
 
    public function ambilPeringkat($peringkat)
    {
        $klasemen = $this->cetakKlasemen();
        $klubList = array_keys($klasemen);
 
        if ($peringkat < 1 || $peringkat > count($klubList)) {
            return null;
        }
 
        return $klubList[$peringkat - 1];
    }
}
 
$klasemen = new Klasemen(['Liverpool', 'Chelsea', 'Arsenal']);
 
$klasemen->catatPermainan('Arsenal', 'Liverpool', '2:1');
$klasemen->catatPermainan('Arsenal', 'Chelsea', '1:1');
$klasemen->catatPermainan('Chelsea', 'Arsenal', '0:3');
$klasemen->catatPermainan('Chelsea', 'Liverpool', '3:2');
$klasemen->catatPermainan('Liverpool', 'Arsenal', '2:2');
$klasemen->catatPermainan('Liverpool', 'Chelsea', '0:0');
$klasemen->catatPermainan('Barcelona', 'Madrid', '0:0');
 
 
print_r($klasemen->cetakKlasemen());
 
echo 'Peringkat ke-2: ' . $klasemen->ambilPeringkat(2);
 

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