PHP

Calling itself a static function in php

//https://www.php.net/manual/en/language.oop5.static.php

self::staticMethod();

static function php

<?php
class Car
{
    public function test($var = 'Hello kinjal')
    {
        $this->var = $var;
        return $this->var;
    }
}
class Bike
{
    public static function test($var)
    {
        $var = '<br>this is static function';
        return $var;
    }
}
$obj = new Car();
echo $obj->test();
echo Bike::test('this is non static');      //static function called using :: double colon

?>

static functions php

class Products {

	protected $id;
    
    public function setId($id)
    { 
    	return $this->id = $id;
    }
    
    public function getProduct()
    { 
    	$arr_list = [
        				[
                          'name'=>'Proton',
                          'year' => 1987
                        ],
                        [
                          'name'=>'Produa',
                          'year' => 1990
                        ],
                    ];
    	return $arr_list;
    }

	public static function product_list()
    {
    	//whatever data want to return
        $arr_list = [
        				[
                          'name'=>'Proton',
                          'year' => 1987
                        ],
                        [
                          'name'=>'Produa',
                          'year' => 1990
                        ],
                    ];
    	return $arr_list;
    }
    
    
}

//static can call directly  
$lists = Product::product_list();

//non static
$product = new Product();
$lists = $product->getProduct();

//when calling class must alert memory consume. 

php call static method from class

ClassName::functionName();

php call static function from instance

$class = get_class($example);
$class::setData('some', 'data');