Random i php!

Hvorfor vil dette ikke virke?

<?
$connect = mysql_connect("localhost","webgeek","******");
mysql_select_db("webgeek");
$query = mysql_query("SELECT * FROM konkurrence ORDER BY id desc");
while ($row = mysql_fetch_array($query)){
?>
<?php
$tal = rand(0, count("$row[spg]")-1);
echo "$tal";
}
?>

<form action="tjek_svar.php" method="post">
Dit svar:<input type="text" name="svar"><br>
<input type="submit" value="Svar!">