PHP Header and ASP redirect comparison

To implement redirection in ASP is to use the Response.Redirect function:
To use one example:
Response.Redirect ". /test.asp "
There are similar functions in PHP: Header
To use one example:
Header ("Location:.. /test.php ");
But there is a difference between the two.
The redirect function of an ASP can work after sending a header file to the customer.
Such as

<%response.redirect ". /test.asp "%>

Check that the following code in PHP will report an error:

Header ("Location:.. /test.php ");
?>

This is the only way:
Header ("Location:.. /test.php ");
?>
...
That is, the header function cannot send any data to the customer before.

Look again at the following example:
in ASP

<%
Response.Redirect ". /a.asp "
Response.Redirect ". /b.asp "
%>

The result is a redirected a.asp file.
What about PHP?
Header ("Location:.. /a.php ");
Header ("Location:.. /b.php ");
?>

We found it redirected b.php.
The subsequent code is no longer executed after executing redirect in ASP.
PHP continues to execute the following code after the header is executed.
In this regard, header redirection in PHP is not as good as redirection in ASP. Sometimes after we redirect, we cannot execute the following code:
Generally, we use
if (...)
Header ("...");
Else
{
...
}
But we can simply use the following method:
if (...)
{Header ("..."); break;}

