# PHP Options&Information

## Introduction

This functions enable you to get a lot of information about PHP itself, e.g. runtime configuration, loaded extensions, version and much more. You'll also find functions to set options for your running PHP. The probably best known function of PHP - phpinfo() - can be found here.

## Requirements

No external libraries are needed to build this extension.

## Installation

There is no installation needed to use these functions; they are part of the PHP core.

## Runtime Configuration

The behaviour of these functions is affected by settings in php.ini.

PHP Options/Inf Configuration Options
Name | Default | Changeable | Changelog
--- | --- | --- | ---
assert.active | "1" | PHP_INI_ALL |
assert.bail | "0" | PHP_INI_ALL |
assert.warning | "1" | PHP_INI_ALL |
assert.callback | NULL | PHP_INI_ALL |
assert.quiet_eval | "0" | PHP_INI_ALL |
enable_dl | "1" | PHP_INI_SYSTEM | Removed in PHP 6.0.0.
max_execution_time | "30" | PHP_INI_ALL |
max_input_time | "-1" | PHP_INI_PERDIR | Available since PHP 4.3.0.
max_input_nesting_level | "64" | PHP_INI_PERDIR | Available since PHP 4.4.8. Removed in PHP 5.0.0.
magic_quotes_gpc | "1" | PHP_INI_PERDIR | PHP_INI_ALL in PHP <= 4.2.3. Removed in PHP 6.0.0.
magic_quotes_runtime | "0" | PHP_INI_ALL | Removed in PHP 6.0.0.

For further details and definitions of the PHP_INI_* constants, see the php.ini directives.

Here's a short explanation of the configuration directives.

`assert.active` boolean

  Enable assert() evaluation.

`assert.bail` boolean

  Terminate script execution on failed assertions.

`assert.warning` boolean

  Issue a PHP warning for each failed assertion.

`assert.callback` string

  user function to call on failed assertions

`assert.quiet_eval` boolean

  Use the current setting of error_reporting() during assertion expression evaluation. If enabled, no errors are shown (implicit error_reporting(0)) while evaluation. If disabled, errors are shown according to the settings of error_reporting()

`enable_dl` boolean

  This directive is really only useful in the Apache module version of PHP. You can turn dynamic loading of PHP extensions with dl() on and off per virtual server or per directory.

  The main reason for turning dynamic loading off is security. With dynamic loading, it's possible to ignore all open_basedir restrictions. The default is to allow dynamic loading, except when using safe mode. In safe mode, it's always impossible to use dl().

`max_execution_time` integer

  This sets the maximum time in seconds a script is allowed to run before it is terminated by the parser. This helps prevent poorly written scripts from tying up the server. The default setting is 30.

  The maximum execution time is not affected by system calls, stream operations etc. Please see the set_time_limit() function for more details.

  You can not change this setting with ini_set() when running in safe mode. The only workaround is to turn off safe mode or by changing the time limit in the php.ini.

  Your web server can have other timeouts. E.g. Apache has Timeout directive, IIS has CGI timeout function, both default to 300 seconds. See the web server documentation for meaning of it.

`max_input_time` integer

  This sets the maximum time in seconds a script is allowed to parse input data, like POST, GET and file uploads.

`max_input_nesting_level` integer

  Sets the max nesting dept of input variables (i.e. $_GET, $_POST..)

`magic_quotes_gpc` boolean
  Warning

  This feature is DEPRECATED and REMOVED as of PHP 6.0.0. Relying on this feature is highly discouraged.

  Sets the magic_quotes state for GPC (Get/Post/Cookie) operations. When magic_quotes are on, all ' (single-quote), " (double quote), \ (backslash) and NUL's are escaped with a backslash automatically.

  > Note: In PHP 4, also $_ENV variables are escaped.

  > Note: If the magic_quotes_sybase directive is also ON it will completely override magic_quotes_gpc. Having both directives enabled means only single quotes are escaped as ''. Double quotes, backslashes and NUL's will remain untouched and unescaped.

  See also get_magic_quotes_gpc()

`magic_quotes_runtime` boolean
  Warning

  This feature is DEPRECATED and REMOVED as of PHP 6.0.0. Relying on this feature is highly discouraged.

  If `magic_quotes_runtime` is enabled, most functions that return data from any sort of external source including databases and text files will have quotes escaped with a backslash. If magic_quotes_sybase is also on, a single-quote is escaped with a single-quote instead of a backslash.

## Resource Types

This extension has no resource types defined.

## Predefined Constants

The constants below are always available as part of the PHP core.

Pre-defined phpcredits() constants
Constant | Value | Description
--- | --- | ---
CREDITS_GROUP | 1 | A list of the core developers
CREDITS_GENERAL | 2 | General credits: Language design and concept, PHP authors and SAPI module.
CREDITS_SAPI | 4 | A list of the server API modules for PHP, and their authors.
CREDITS_MODULES | 8 | A list of the extension modules for PHP, and their authors.
CREDITS_DOCS | 16 | The credits for the documentation team.
CREDITS_FULLPAGE | 32 | Usually used in combination with the other flags. Indicates that a complete stand-alone HTML page needs to be printed including the information indicated by the other flags.
CREDITS_QA | 64 | The credits for the quality assurance team.
CREDITS_ALL | -1 | All the credits, equivalent to using: CREDITS_DOCS + CREDITS_GENERAL + CREDITS_GROUP + CREDITS_MODULES + CREDITS_QA CREDITS_FULLPAGE. It generates a complete stand-alone HTML page with the appropriate tags. This is the default value.

phpinfo() constants
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.
INFO_ENVIRONMENT | 16 | Environment Variable information that's also available in $_ENV.
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.

`ASSERT_ACTIVE` (integer)
`ASSERT_CALLBACK` (integer)
`ASSERT_BAIL` (integer)
`ASSERT_WARNING` (integer)
`ASSERT_QUIET_EVAL` (integer)

## Table of Contents

- assert_options — Set/get the various assert flags
- assert — Checks if assertion is FALSE
- dl — Loads a PHP extension at runtime
- extension_loaded — Find out whether an extension is loaded
- get_cfg_var — Gets the value of a PHP configuration option
- get_current_user — Gets the name of the owner of the current PHP script
- get_defined_constants — Returns an associative array with the names of all the constants and their values
- get_extension_funcs — Returns an array with the names of the functions of a module
- get_include_path — Gets the current include_path configuration option
- get_included_files — Returns an array with the names of included or required files
- get_loaded_extensions — Returns an array with the names of all modules compiled and loaded
- get_magic_quotes_gpc — Gets the current configuration setting of magic quotes gpc
- get_magic_quotes_runtime — Gets the current active configuration setting of magic_quotes_runtime
- get_required_files — Alias of get_included_files
- getenv — Gets the value of an environment variable
- getlastmod — Gets time of last page modification
- getmygid — Get PHP script owner's GID
- getmyinode — Gets the inode of the current script
- getmypid — Gets PHP's process ID
- getmyuid — Gets PHP script owner's UID
- getopt — Gets options from the command line argument list
- getrusage — Gets the current resource usages
- ini_alter — Alias of ini_set
- ini_get_all — Gets all configuration options
- ini_get — Gets the value of a configuration option
- ini_restore — Restores the value of a configuration option
- ini_set — Sets the value of a configuration option
- main — Dummy for main
- memory_get_peak_usage — Returns the peak of memory allocated by PHP
- memory_get_usage — Returns the amount of memory allocated to PHP
- php_ini_scanned_files — Return a list of .ini files parsed from the additional ini dir
- php_logo_guid — Gets the logo guid
- php_sapi_name — Returns the type of interface between web server and PHP
- php_uname — Returns information about the operating system PHP is running on
- phpcredits — Prints out the credits for PHP
- phpinfo — Outputs lots of PHP information
- phpversion — Gets the current PHP version
- putenv — Sets the value of an environment variable
- restore_include_path — Restores the value of the include_path configuration option
- set_include_path — Sets the include_path configuration option
- set_magic_quotes_runtime — Sets the current active configuration setting of magic_quotes_runtime
- set_time_limit — Limits the maximum execution time
- sys_get_temp_dir — Returns directory path used for temporary files
- version_compare — Compares two "PHP-standardized" version number strings
- zend_logo_guid — Gets the Zend guid
- zend_thread_id — Returns a unique identifier for the current thread
- zend_version — Gets the version of the current Zend engine