phpinfo是一个服务器的运行指令，可以显示php服务器的配置信息。

phpinfo

显示php服务器的配置信息

(PHP 3, PHP 4, PHP 5)

phpinfo -- Outputs lots of PHP information

Description

bool phpinfo ( )

Outputs a large amount of information about the current state of PHP. This includes information about PHP compilation options and extensions, the PHP version, server information and environment (if compiled as a module), the PHP environment, OS version information, paths, master and local values of configuration options, HTTP headers, and the PHP License.

Because every system is setup differently, phpinfo（ ） is commonly used to check configuration settings and for available predefined variables on a given system. Also, phpinfo（ ） is a valuable debugging tool as it contains all EGPCS (Environment, GET, POST, Cookie, Server) data.

The output may be customized by passing one or more of the following constants bitwise values summed together in the optional what parameter. One can also combine the respective constants or bitwise values together with the or operator.

表格 1. phpinfo（ ） options

Name (constant) Value Description

INFO_GENERAL 1 The configuration line, php.ini location, build date, Web Server, System and more.

INFO_CREDITS 2 PHP Credits. See also phpcredits（ ）.

INFO_CONFIGURATION 4 Current Local and Master values for PHP directives. See also ini_get（ ）.

INFO_MODULES 8 Loaded modules and their respective settings. See also get_loaded_extensions（ ）.

INFO_ENVIRONMENT 16 Environment Variable information that's also available in Array.

INFO_VARIABLES 32 Shows all predefined variables from EGPCS (Environment, GET, POST, Cookie, Server).

INFO_LICENSE 64 PHP License information. See also the license FAQ.

INFO_ALL -1 Shows all of the above. This is the default value.

例子 1. phpinfo（ ） examples

＜?php

// Show all information, defaults to INFO_ALL

phpinfo（ ）;

// Show just the module information.

// phpinfo(8) yields identical results.

phpinfo(INFO_MODULES);

?＞

注: Parts of the information displayed are disabled when the expose_php configuration setting is set to off. This includes the PHP and Zend logos, and the credits.

注: phpinfo（ ） outputs plain text instead of HTML when using the CLI mode.

bool phpinfo ([ int = INFO_ALL ] )

输出 PHP 当前状态的大量信息，包含了 PHP 编译选项、启用的扩展、PHP 版本、服务器信息和环境变量（如果编译为一个模块的话）、PHP环境变量、操作系统版本信息、path 变量、配置选项的本地值和主值、HTTP 头和PHP授权信息(License)。

因为每个系统安装得有所不同， phpinfo（ ） 常用于在系统上检查 配置设置和 预定义变量。

phpinfo（ ） 同时是个很有价值的、包含所有 EGPCS(Environment, GET, POST, Cookie, Server) 数据的调试工具。

可以用以下的一个或多个 constants 用位运算传递给可选的 what 参数来定制输出的信息。 该参数可以把常量相加或者用 or 操作符按位运算。

成功时返回 TRUE， 或者在失败时返回 FALSE.