Some predefined variables in php $ _ SERVER usage summary

This article mainly introduces the usage of several predefined variables $ _ SERVER in php. the instance summarizes common usage of the predefined variable $ _ SERVER on the SERVER, you can refer to the examples in this article to summarize the usage of several predefined variables $ _ SERVER in php. Share it with you for your reference. The details are as follows:

The code is as follows:

<? Php
Echo 'documentroot: '. $ _ SERVER ['document _ root'].'
'; // Root directory, defined in the apache configuration file: httpd. conf for example: DocumentRoot "D:/work/php_root"
Echo 'httphost: '. $ _ SERVER ['http _ host'].'
'; // Domain name, such as localhost
Echo 'phpself: '. $ _ SERVER ['php _ SELF'].'
'; // Path from the root directory to the file itself
Echo 'script filename'. $ _ SERVER ['script _ filename'].'
'; // Documentroot + phpself
Echo 'request uri '. $ _ SERVER ['request _ URI'].'
'; // All URL strings starting from the root directory, including characters after the Question Mark
Echo 'request method: '. $ _ SERVER ['request _ method'].'
'; // Request method
Echo 'name: '. $ _ REQUEST ['name'].'
'; // The value of the request parameter
?>

I hope this article will help you with PHP programming.