if (/*Condition to redirect*/){
//You need to redirect
header("Location: http://www.yourwebsite.com/user.php"); /* Redirect browser */
exit();
}
else{
// do some
}
header("Location: http://example.com/redirect_page.php");
die(); //Force the script to quit, or you would raise an error...
<?php header ("location: http://domain.com/"); ?>