php等待几秒后跳转

<?php header("refresh:5;url=http://www.XXXXX.com"); print('正在加载，请稍等...<br>五秒后自动跳转。'); ?>

<?php 
sleep(3);
Header(“location:index.php”);
?>

<?php 
sleep(3);
$url = "http://www.guanwei.org"; 
echo "<script language='javascript' type='text/javascript'>"; 
echo "window.location.href='$url'"; 
echo "</script>"; 
?>

<?php 
$url = "http://www.guanwei.org"; 
echo "<script language='javascript' type='text/javascript'>";
echo "setTimeout(\"window.location.href='$url'\", 3000)";
echo "</script>"; 
?>