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getenv

getenv

(PHP 4, PHP 5)

getenvGets the value of an environment variable

说明

string getenv ( string $varname )

Gets the value of an environment variable.

You can see a list of all the environmental variables by using phpinfo(). Many of these variables are listed within » RFC 3875, specifically section 4.1, "Request Meta-Variables".

参数

varname

The variable name.

返回值

Returns the value of the environment variable varname, or FALSE if the environment variable varname does not exist.

范例

Example #1 getenv() Example

<?php
// Example use of getenv()
$ip getenv('REMOTE_ADDR');

// Or simply use a Superglobal ($_SERVER or $_ENV)
$ip $_SERVER['REMOTE_ADDR'];
?>

参见

  • putenv() - Sets the value of an environment variable
  • apache_getenv() - Get an Apache subprocess_env variable
  • Superglobals

  • assert
  • assert_options
  • dl
  • extension_loaded
  • gc_collect_cycles
  • gc_disable
  • gc_enable
  • gc_enabled
  • getenv
  • getlastmod
  • getmyinode
  • getopt
  • getrusage
  • get_cfg_var
  • get_current_user
  • get_defined_constants
  • get_extension_funcs
  • get_included_files
  • get_include_path
  • get_loaded_extensions
  • get_magic_quotes_gpc
  • get_magic_quotes_runtime
  • get_required_files
  • ini_alter
  • ini_get
  • ini_get_all
  • ini_restore
  • ini_set
  • magic_quotes_runtime
  • main
  • memory_get_peak_usage
  • memory_get_usage
  • phpcredits
  • phpversion
  • php_ini_loaded_file
  • php_ini_scanned_files
  • php_logo_guid
  • php_sapi_name
  • php_uname
  • putenv
  • restore_include_path
  • set_include_path
  • set_magic_quotes_runtime
  • set_time_limit
  • sys_get_temp_dir
  • version_compare
  • zend_logo_guid
  • zend_thread_id
  • zend_version
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