$host= "localhost";
$user= "xxxx";
$pass= "xxxx";
$db="xxxx";

$connect= mysql_connect($host,$user,$pass);
if (!$connect)die ("Cannot connect!");
mysql_select_db($db, $connect);

$result = mysql_query("
    SELECT
        *
    FROM
        xxxx
    ");


if($result){
    while($row = mysql_fetch_array($result, MYSQL_ASSOC)){

$url = $row['xxxx'];
echo $url;
}
}

row1    //wait 5 sec
row2   //wait 5 sec
row3   //wait 5 sec
row4   //wait 5 sec