$procura4 = mysqli_query($link, "SELECT * from jogo1 ORDER by steamid");

while($array4 = mysqli_fetch_array($procura4)){

$nrsteamids1[] = $array4["steamid"];

}

$nrsteamids2 = array_unique($nrsteamids1);
$nrsteamids2 = array_values($nrsteamids2);

echo count($nrsteamids2);