Differences between _ FILE _ and $ _ SERVER ['script _ filename ']

Differences between _ FILE _ and $ _ SERVER [SCRIPT_FILENAME]

Echo $ _ SERVER ['script _ filename'].' '; Echo _ FILE __; Run a. php to obtain: Require 'a. php '; Run B. php and the result is: E:/var/www/B. php ($ _ SERVER ['script _ filename']) E: \ wamp \ www \ Text \. php (_ FILE __) The difference between the two is as follows: $ _ SERVER ['script _ filename'] absolute path of the currently executed program and the FILE name _ FILE _ Original FILE (included FILE) absolute path and file name Do you understand? For the differences between _ FILE _ and $ _ SERVER ['script _ filename'], let's take a good look at the meanings in the above example.