Reserved variable PHP

Predefine variable PHP note :? $ _ SERVER: www. php. netmanualzhreserved. variables. server. php $ _ ENV: www. php. netmanualzhreserved. variables. environment. php? $ _ POST, $ _ GET's predefined variable PHP

Note:

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$ _ SERVER: http://www.php.net/manual/zh/reserved.variables.server.php

$ _ ENV: http://www.php.net/manual/zh/reserved.variables.environment.php

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$ _ POST and $ _ GET can all be obtained through $ _ REQUEST, but $ _ REQUEST is slower than $ _ GET and $ _ POST.

$ _ FILE: FILE upload, the http://www.php.net/manual/zh/features.file-upload.post-method.php only has data when uploading files in POST. Refer to Example #3 on the help page.

$ _ COOKIE and $ _ SESSION are used for SESSION control.

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In addition, to customize the value in $ _ SERVER, you only need to add some common variables (mostly used for clusters) in fastcgi_params ). Add the following code:

Fastcgi_param? DB4_USER ?? Root;
Fastcgi_param? DB4_PASS? ? "";
Fastcgi_param? DB4_HOST ?? Localhost;
Fastcgi_param? DB4_PORT ?? 3306;
Fastcgi_param? DB4_NAME ?? Test;

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Then, get the current environment variable value root in $ _ SERVER ["DB4_USER.