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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 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() is called.

## Return Values

A multidimensional array with all the variables.

## 範例

範例 1. get_defined_vars() 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()));
?>`

## ChangeLog

Version | Description
--- | ---
5 | The $GLOBALS variable is included in the results of the array returned.

## 參考

isset()
get_defined_functions()
get_defined_constants()

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