<?
//change below
$server_list = array(1=>'http://apple.com','http://microsoft.com');
$server_weights = array(1=>50,50); // in % out of 100

//dont touch below
$random_number = rand(1,100);
$server_count = count($server_list);
$current_percent = 0;
$selected_server = 0;
while ($current_percent < $random_number)
{
++$selected_server;
$current_percent = $current_percent + $server_weights[$selected_server];
}
echo $server_list[$selected_server];
header( "Location: $server_list[$selected_server]" ) ;
?>