Generate new random number every 5 seconds PHP

I need to update a variable number $x with a new random value every 5 seconds (length not really important). I know how to do it with a finite loop, however if I want it to be continuous and always just update. I know how to do it with just updating the header, but since I dont want the entire page to reload that is not really an option. Below Ive tried to trick it with a infinite loop (not the best way), but what I am also seeing running this is that it gives me the same number over and over.

Any ideas?

    <?php

echo "Random Number Updating <br>";
$n = 5;
$x = rand(1,10);

function random() {
    $interval = 5; // Interval in seconds
    srand(floor(time() / $interval)); 
    $x = rand(0, 10); 
    echo "$x";
}

while ($x <= 6){
 random();   
}


?>