Common Environment system variables in php

Source: Internet
Author: User
Tags constant file upload php script

PHP environment variables include $ GLOBALS [], $ _ SERVER [], $ _ GET [], $ _ POST [], $ _ COOKIE [], $ _ FILES [], $ _ ENV [], $ _ REQUEST [], and $ _ SESSION []. $ _ GET and $ _ POST are mainly for data submitted by FORM forms. $ _ COOKIE and $ _ SESSION are mainly for client browser and server SESSION data. $ _ FILES mainly targets the data submitted during File upload. $ _ REQUEST mainly targets all REQUEST arrays in the submission form, including all content in $ _ GET, $ _ POST, and $ _ COOKIE, you can use the print_r function to output $ _ REQUEST or $ _ COOKIE for comparison.

$ _ SERVER variable
Is a global PHP environment variable that contains server-side information. $ HTTP_SERVER_VARS is used in versions earlier than PHP4.1.0.


$ _ SERVER ['php _ SELF ']

# The file name of the script being executed, which is related to document root. In FORM, if the execution file is itself, you can use

$ _ SERVER ['query _ string']

# Obtain the query statement, that is, get '? 'Value after

$ _ SERVER ['document _ root']

# The document root directory where the script is currently running. Defined in the server configuration file.

$ _ SERVER ['http _ ACCEPT ']

# Accept of the current request: content in the header.

$ _ SERVER ['http _ accept_charset']

# Accept-Charset of the current request: content in the header. Example: "ISO-8859-1, *, UTF-8 ".

$ _ SERVER ['http _ ACCEPT_ENCODING ']

# Accept-Encoding of the current request: content in the header. For example, "gzip ".

$ _ SERVER ['http _ ACCEPT_LANGUAGE ']

# Accept-Language of the current request: content in the header. For example, "en ".

$ _ SERVER ['http _ connection']

# Connection of the current request: content in the header. For example, "Keep-Alive ".

$ _ SERVER ['http _ host']

# Host of the current request: content in the header.

$ _ SERVER ['http _ referer']

# URL of the previous page linked to the current page.

$ _ SERVER ['http _ USER_AGENT ']

# User_Agent of the current request: content in the header.

$ _ SERVER ['server _ name']

# Name of the server host where the currently running PHP program is located.

$ _ SERVER ['request _ method']

# The request method used to access the page, namely GET, HEAD, POST, and PUT.

$ _ SERVER ['document _ root']

# The document root directory of the currently running PHP program. That is, the definition in the PHP. Ini file.

$ _ SERVER ['http _ referer']

# URL of the previous page linked to the current page. This function is useful in page navigation.

$ _ SERVER ['remote _ ADDR ']

# Browsing the IP address of the visitor on the current page.

$ _ SERVER ['remote _ host']

# The host name of the user browsing the current page.

$ _ SERVER ['remote _ port']

# The port used by the user who is visiting to connect to the server.

$ _ SERVER ['script _ filename']

# The absolute path name of the currently executed script.

$ _ SERVER ['server _ port']

# The port used by the server

$ _ SERVER ['script _ name']

# Contains the path of the current script. This is useful when the page needs to point to itself.

$ _ SERVER ['request _ URI ']

# The URI required to access this page. For example, "/index.html ".

$ _ SERVER ['php _ AUTH_USER ']

# In the HTTP user logon authentication function, this variable is the user name entered by the user.

$ _ SERVER ['php _ AUTH_PW ']

# In the HTTP user logon authentication function, this variable is the password entered by the user.

$ _ SERVER ['auth _ type']

# In the HTTP user logon authentication function, this variable is the authentication type.

$ _ SERVER ['server _ soft']
# The string identified by the server, which is provided in the header of the response request.

System constant
_ FILE _ absolute path and FILE name of the current PHP script

_ LINE _ stores the row number of the constant

_ FUNCTION _ name of the FUNCTION where the constant is stored

_ CLASS _ stores the name of the CLASS where the constant is located.

PHP_VERSION stores the current PHP version, which can also be obtained through the PHPVERSION () function.

PHP_ OS stores the operating system of the current server

Related Article

E-Commerce Solutions

Leverage the same tools powering the Alibaba Ecosystem

Learn more >

Apsara Conference 2019

The Rise of Data Intelligence, September 25th - 27th, Hangzhou, China

Learn more >

Alibaba Cloud Free Trial

Learn and experience the power of Alibaba Cloud with a free trial worth $300-1200 USD

Learn more >

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.