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# get_defined_vars

(PHP 4 >= 4.0.4, PHP 5)

get_defined_vars -- Returns an array of all defined variables

## Description

array get_defined_vars ( void )

This function returns an multidimensional array containing a list of all defined variables, be them environment, server or user-defined variables.

`<?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 $arr["_"]; // print the command-line paramaters if any print_r($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(), get_defined_functions() and get_defined_constants().

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