Am learning php and working my way trough a book & youtube tutorials.
tried this

PHP Code:
<?php
echo "<br>This file is "._FILE_;
echo "<br>This is line number "._LINE_;
echo "<br>I am using ".PHP_VERSION;
echo "<br>This test is being run on ".PHP_OS;
?>
It should work according to the book and a google search, but this is what I get.

Notice: Use of undefined constant _FILE_ - assumed '_FILE_' in C:\xampp\htdocs\phpBookMySql\index.php on line 4

"This file is _FILE_
Notice: Use of undefined constant _LINE_ - assumed '_LINE_' in C:\xampp\htdocs\phpBookMySql\index.php on line 5
This is line number _LINE_
I am using 5.4.4
This test is being run on WINNT "

why is _FILE_ & _LINE_ not showing up?
thx
D