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PHP get_defined_vars() Function Usage and Example

PHP available functions

get_defined_vars() The function returns an array composed of all defined variables.

Version requirement: PHP 4 => 4.0.4, PHP 5, PHP 7

Syntax

array get_defined_vars ( void )

Parameter description:

  • void.

Return value

Returns a multidimensional array containing a list of all defined variables, including environment variables, server variables, and user-defined variables.

Online Example

<?php
$b = array(1,1,2,3,5,8);
 
$arr = get_defined_vars();
 
// Print $b
print_r($arr["b"]);
 
// Print the path of the PHP interpreter (if PHP is used as CGI)
// For example:/usr/local/bin/php
echo $arr["_"];
 
// Print command line parameters (if any)
print_r($arr["argv"]);
 
// Print all server variables
print_r($arr["_SERVER"]);
 
// Print all available keys of the variable array
print_r(array_keys(get_defined_vars()));
?>

The execution result is shown as follows:

Array
(
    [0]]=> 1
    [1]]=> 1
    [2]]=> 2
    [3]]=> 3
    [4]]=> 5
    [5]]=> 8
)
Array
(
    [0]]=> /tmp/543750210/main.php
)
Array
(
    [PATH]]=> /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
    [HOSTNAME]]=>glot-runner
    [PHPIZE_DEPS]]=>autoconf        dpkg-dev        file        g++         gcc        libc-dev        make        pkg-config        re2c
    [PHP_INI_DIR]]=> /usr/local/etc/php
    [PHP_CFLAGS]]=> -fstack-protector-strong -fpic -fpie -O2
    [PHP_CPPFLAGS]]=> -fstack-protector-strong -fpic -fpie -O2
    [PHP_LDFLAGS]]=> -Wl,-O1 -Wl,--hash-style=both -pie
    [GPG_KEYS]]=> 1729F83938DA44E27BA0F4D3DBDB397470D12172 B1B44D8F021E4E2D6021E995DC9FF8D3EE5AF27F
    [PHP_VERSION]]=> 7.2.1
    [PHP_URL]]=>https://secure.php.net/get/php-7.2.1.tar.xz/from/this/mirror
    [PHP_ASC_URL]]=>https://secure.php.net/get/php-7.2.1.tar.xz.asc/from/this/mirror
    [PHP_SHA256]]=> 6c6cf82fda6660ed963821eb0525214bb3547e8e29f447b9c15b2d8e6efd8822
    [PHP_MD5]]=> 
    [HOME]]=> /home/glot
    [PHP_SELF]]=> /tmp/543750210/main.php
    [SCRIPT_NAME]]=> /tmp/543750210/main.php
    [SCRIPT_FILENAME]]=> /tmp/543750210/main.php
    [PATH_TRANSLATED]]=> /tmp/543750210/main.php
    [DOCUMENT_ROOT]]=> 
    [REQUEST_TIME_FLOAT]]=> 1524198667.12
    [REQUEST_TIME]]=> 1524198667
    [argv]]=>Array
        (
            [0]]=> /tmp/543750210/main.php
        )
    [argc]]=> 1
)
Array
(
    [0]]]=>_GET
    [1]]=>_POST
    [2]]=>_COOKIE
    [3]]=>_FILES
    [4]]=>argv
    [5]]=>argc
    [6]]=>_SERVER
    [7]]=>b
    [8]]=>arr
)

PHP available functions