How Can I Access a Global Variable in All PHP Functions Without Repeatedly Declaring it?

Global Variable Declaration in PHP

Problem:

In a PHP script, it is necessary to declare a variable as global inside each function that needs to access it. Is there a way to define a global variable once and access it in all functions simultaneously without manually using global within each function?

Answer:

There are two alternative methods:

Method 1: Using the $GLOBALS Array:

The $GLOBALS array is an associative array that contains references to all variables defined in the global scope. To declare a global variable using $GLOBALS, simply assign it a value outside of any function:

$GLOBALS['a'] = 'localhost';

Once defined, you can access $GLOBALS['a'] in any function:

function body() {
    echo $GLOBALS['a'];
}

Method 2: Using a Class with Properties:

If functions share a set of variables, consider encapsulating them in a class with properties:

class MyTest {
    protected $a;

    public function __construct($a) {
        $this->a = $a;
    }

    public function head() {
        echo $this->a;
    }

    public function footer() {
        echo $this->a;
    }
}

Instantiate the class outside of any function and access its properties within the methods:

$a = 'localhost';
$obj = new MyTest($a);

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