Returns an array of all defined variables

floatval
get_resource_type
Variable handling Functions
PHP Manual

# 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.

### Examples

Example #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
--- | ---
5.0.0 | The $GLOBALS variable is included in the results of the array returned.

### See Also

- isset() - Determine if a variable is set and is not NULL
- get_defined_functions() - Returns an array of all defined functions
- get_defined_constants() - Returns an associative array with the names of all the constants and their values

floatval
get_resource_type
Variable handling Functions
PHP Manual