getenv(3) [php man page]

GETENV(3)								 1								 GETENV(3)

getenv - Gets the value of an environment variable

SYNOPSIS

       string getenv (string  $varname)

DESCRIPTION

	Gets the value of an environment variable.

	You  can  see  a list of all the environmental variables by using phpinfo(3). Many of these variables are listed within RFC 3875, specifi-
       cally section 4.1, "Request Meta-Variables".

PARAMETERS

	      o $varname
		- The variable name.

RETURN VALUES

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

EXAMPLES

       Example #1

	      getenv(3) Example

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

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

SEE ALSO

       putenv(3), apache_getenv(3), Superglobals.

PHP Documentation Group 														 GETENV(3)

getenv(3C)						   Standard C Library Functions 						getenv(3C)

NAME

       getenv - return value for environment name

SYNOPSIS

       #include <stdlib.h>

       char *getenv(const char *name);

DESCRIPTION

       The  getenv()  function	searches  the environment list (see environ(5)) for a string of the form name=value and, if the string is present,
       returns a pointer to the value in the current environment.

RETURN VALUES

       If successful, getenv() returns a pointer to the value in the current environment; otherwise, it returns a null pointer.

USAGE

       The getenv() function can be safely called from a multithreaded	application.   Care  must  be  exercised  when	using  both  getenv()  and
       putenv(3C)  in  a multithreaded application.  These functions examine and modify the environment list, which is shared by all threads in an
       application.  The system prevents the list from being accessed simultaneously by two different threads.	It does not, however, prevent  two
       threads from successively accessing the environment list using  getenv() or putenv(3C).

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       exec(2), putenv(3C), attributes(5), environ(5), standards(5)

SunOS 5.10							    24 Jul 2002 							getenv(3C)