get_defined_vars()

get_defined_vars() — Returns an array of all defined variables.

Built-in function of PHP 8.5. The manual lists it as available in PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8. This page is the reference card: signature, parameters and return value, plus the changelog and the example the manual provides.

What it does

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.

Signature

get_defined_vars(): array

Parameters

This function takes no parameters.

Return value

A multidimensional array with all the variables.

Example

A runnable snippet:

$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

get_defined_functions(), get_defined_constants()

All PHP 8.5 built-in functions

Reference card built from the PHP manual page get_defined_vars() (PHP documentation, CC BY 3.0). The page is generated from the manual, so the wording of the parameter and return value text follows php.net.