php variable based on a random variable

I'm new to php and I wrote a code that takes a random winner out of an array and displays it, then I wanted to try to display all the names without the winner's, but how can I unset the winner by using the random number generated? I managed to unset a random name but not the same as the winner...

    <?php

// array

$winner = array();
    array_push($winner,"sonia");
    array_push($winner,"ice");
    array_push($winner,"sasha");
    array_push($winner,"isa");
    array_push($winner,"omar");
    array_push($winner,"anwar");

// random winner

    $giocatori = count($winner);   
        $random = rand(0,$giocatori -1);   
            unset($winner[$random]);

// Sort the list

sort($winner);
    echo "I giocatori sono: ";
        print join(", ",$winner);

// Print the winner's name in ALL CAPS

$truewinner = strtoupper($winner[$random]);
    echo "<br><br>";
    echo "il vincitore è: ";

// Print winner + sentence   

$losers = "losers";
$losers = strtoupper($losers);    
    echo (strtoupper($winner[$random]));
    echo "<br><br>";
    echo "all the players are: $losers beside $truewinner"; 

?>