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If you are new to PHP or just need to refresh your skills, this is the place to start. This series of tutorials will give you the basic knowledge you will need to create a simple PHP website.

PHP is a reflective programming language originally designed for producing dynamic web pages.[1] PHP is used mainly in server-side scripting, but can be used from a command line interface or in standalone graphical applications. Textual User Interfaces can also be created using ncurses.

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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.

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

VersionDescription
5.0.0 The $GLOBALS variable is included in the results of the array returned.

See Also

isset()
get_defined_functions()
get_defined_constants()

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Another Useful functions:


zend-api.zend-exception-get-default | function.yp-get-default-domain | function.udm-get-doc-count | function.stream-context-get-default | function.openssl-pkey-get-details | function.newt-listitem-get-data | function.msession-get-data | function.ldap-get-dn | function.iis-get-dir-security | function.i18n-loc-get-default | function.get-defined-vars | function.get-defined-functions | function.get-defined-constants | function.get-declared-interfaces | function.get-declared-classes |


PHP is a widely-used general-purpose scripting language that is especially suited for Web development and can be embedded into HTML. If you are new to PHP and want to get some idea of how it works, try the introductory tutorial. After that, check out the online manual, and the example archive sites and some of the other resources available in the links section.