Variable & Variable Scope | PHP Fundamentals

Gunawan Efendi — Sun, 30 Jun 2024 16:33:30 +0000

Create Variable in PHP

The rules when you create variables in PHP:

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

PHP has 3 variable scopes:

$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();

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

$name = "Gunawan";

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

get_name();

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

Download my repository php fundamental from my github.