- __FILE__ The name of the script file being parsed.
- __LINE__ The number of the line in the script being parsed.
- PHP_VERSION The version of PHP in use.
- PHP_OS The operating system using 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;