<?php

$sayilar = array();
$sayilar[] = 52;
$sayilar[] = 532;
$sayilar[] = 987;
$sayilar[] = 5678;

$sayac = 0;
$toplam = 0;

while ($sayac < count($sayilar))
	$toplam = $toplam + $sayilar[$sayac++];

$ortalama = $toplam / count($sayilar);

echo 'Toplam: ' . $toplam . '<br />';
echo 'Ortalama: ' . $ortalama;

?>