The difference between PHP and ASP about the steering function

Implementing redirection in

ASP is using the response.redirect function:

  usage:
  Response.Redirect ". There are similar functions in/test.asp

php : header

  usages:
  Header ("Location:.") /test.php ");
But there is a difference between the two. The redirect function of

ASP can work after a header file is sent to the customer.

 , such as
<%response.redirect. /test.asp "%>
</body>
Check is PHP The next example code will report an error:

.
Header ("Location:.. /test.php ");
?>
</body>
can only do so:


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

That is, the header function cannot send any data to the customer.

Look at one of the following examples:

In ASP

<%
Response.Redirect ". /a.asp "
Response.Redirect ". /b.asp "
%>
</body>
The result is a redirected a.asp file.

What about php ?

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

We found it redirected to b.php.
The following code is not executed after the redirect is executed in ASP.
and PHP continues to execute the following code after executing the header.
In this respect the header redirection in PHP is not as redirected as in ASP. Sometimes after we redirect, we can't execute the following code:

In general, we use
if (...)
Header ("...");
Else
{
...
}
But we can simply use the following methods:
if (...)
{Header ("...");