PHP phpinfo function

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phpinfo

(PHP 3, PHP 4, PHP 5)

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.

phpinfo() is also 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.

Table 1. phpinfo() options

Returns TRUE on success or FALSE on failure.

Example 1. phpinfo() Example

 
// Show all information, defaults to INFO_ALL
phpinfo();
 
// Show just the module information.
// phpinfo(8) yields identical results.
phpinfo(INFO_MODULES);

Note:
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.

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