Sayısal loto 7 trilyona koşuyor

<?
echo "SAYISAL LOTO TAHMİNLERİ :<br>";
$j=0;
for ($i=0;$i<=5;$i++)
{
  $sayi[$i]=rand(1,49);
}
sort($sayi);
for ($i=0;$i<=4;$i++)
{
  $j++;
  if($sayi[$i]==$sayi[$j]){
    $sayi[$j]=rand(1,49);
  }
}
for ($i=0;$i<=5;$i++)
{
  echo $sayi[$i]." ";
}
?>
<br>
<form name="form1" method="post" action="<?=$PHP_SELF?>">
<input type="submit" name="Submit" value="YENİLE">
</form>