get_defined_vars
(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)
get_defined_vars — Returns an array of all defined variables
Description
get_defined_vars(): array
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.
Parameters
This function has no parameters.
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()));
?>
See Also
- isset() - Determine if a variable is declared and is different than 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
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