php man page for get_defined_vars

GET_DEFINED_VARS(3)							 1						       GET_DEFINED_VARS(3)

get_defined_vars - Returns an array of all defined variables

SYNOPSIS
       array get_defined_vars (void  )

DESCRIPTION
	This  function	returns  a  multidimensional array containing a list of all defined variables, be them environment, server or user-defined
       variables, within the scope that get_defined_vars(3) is called.

RETURN VALUES
	A multidimensional array with all the variables.

EXAMPLES
       Example #1

	      get_defined_vars(3) Example

	      <?php
	      $b = array(1, 1, 2, 3, 5, 8);

	      $arr = get_defined_vars();

	      // print $b
	      print_r($arr["b"]);

	      /* print path to the PHP interpreter (if used as a CGI)
	       * e.g. /usr/local/bin/php */
	      echo $arr["_"];

	      // print the command-line parameters if any
	      print_r($arr["argv"]);

	      // print all the server vars
	      print_r($arr["_SERVER"]);

	      // print all the available keys for the arrays of variables
	      print_r(array_keys(get_defined_vars()));
	      ?>

SEE ALSO
       isset(3), get_defined_functions(3), get_defined_constants(3).

PHP Documentation Group 												       GET_DEFINED_VARS(3)