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[PHP] Include a B.php but not influence A.php


a problem has troubled me for a long time,I have searched ,but haven't found the answer.
some thing like this:

include 'b.php';
echo 'test A.php';//because calling exit in b.php,so this can't be execute

exit("test B.php");

I want to include b.php(b.php is a third library,but it will exit the script)  but no die.I try to find some function that can execute b.php and not die a.php ,but I can't.
are there any other method can do this?