Static Example

<?php
class Person{
    public static $total_people = 0;
    private $name = "";
    function __construct($name){
        $this->name = $name;
        self::$total_people++;
    }
    public function sayName(){
        print($this->name."\n");
    }
    public static function peopleCount(){
        print(self::$total_people."\n");
    }
}

$john = new Person("John");
$john->sayName(); //prints john
Person::peopleCount(); //prints 1
?>