For uses

header('Locatio n: new_page.php');

You can uses ob_start(); and ob_end_flush();

Example::

<?
ob_start();

.....
.....
if ($condition1)
{
header('Locatio n: new_page1.php') ;
}
.....
.....
.....
if ($condition1)
{
header('Locatio n: new_page1.php') ;
}...