변수 및 변수 범위 | PHP 기초

Create Variable in PHP

The rules when you create variables in PHP:

1. Variable declaration with dollar ($) followed by variable name
2. Variable name must start with a letter or underscore (_)
3. Variable name is case-sensitive

Valid variables:

$name = "Gunawan"; //valid $Name = "Gunawan"; //valid $_name = "Gunawan; //valid

Not valid variables:

$4name = "Gunawan"; //not valid $user-name = "Gunawan"; //not valid $this = "Gunawan"; //not valid

Variable Scope

PHP has 3 variable scopes:

1. Global
2. Local
3. Static

Global scope

$name = "Gunawan"; function get_name() { echo $name; // not valid } get_name();

To access a global variable within a function you must declare a global variable with the keyword 'global' within a function.

$name = "Gunawan"; function get_name() { global $name; echo $name; // valid } get_name();

Use Array GLOBALS to Access Global Variable

The second way to access global variables is to use a global array.

$name = "Gunawan"; function get_name() { echo $GLOBALS['name']; // valid } get_name();

Static Variable

function test() { static $number = 0; echo $number; $number++; }

Variable Super Global in PHP:

1. $GLOBALS
2. $_SERVER
3. $_GET
4. $_POST
5. $_FILES
6. $_COOKIE
7. $_SESSION
8. $_REQUEST
9. $_ENV

Download my repository php fundamental from my github.

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