Common global variables in php

: This article mainly introduces common global variables in php. For more information about PHP tutorials, see. Echo $ _ SERVER ['php _ SELF '],'
'; // Address of this page
Echo $ _ SERVER ['http _ referer'],'
'; // Link to the address of the previous page of the current page
Echo $ _ SERVER ['script _ filename'],'
'; // The absolute path of the current script
Echo $ _ SERVER ['remote _ ADDR '],'
'; // The IP address of the client
Echo $ _ SERVER ['query _ string'],'
'; // Query string ,? Next part
Echo $ _ SERVER ['document _ root'],'
'; // Document root directory
Echo $ _ SERVER ['server _ ADDR '],'
'; // Server ip address

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