<?php
$conn=mysql_connect("**","**","**") or die(mysql_error());
mysql_select_db("portal",$conn);
$query = mysql_query("SELECT * FROM 'users' ORDER BY 'id' DESC",$conn);
while($row = mysql_fetch_array($query)){
	echo "<table border='1'><tr><th>id</th></tr><tr><th>username</th></tr><tr><th>password</th></tr><tr><th>email</th></tr>";
	echo "<tr><td>". $row ."</td><tr><tr><td>". $row ."</td><tr><tr><td>". $row ."</td><tr><tr><td>". $row ."</td><tr></table>";
}
?>

ואני מקבל את ההודעה הבאה
Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in d:\program files\easyphp1-8\www\list.php on line 5