Deprecated: Methods with the same name as their class will not be constructors in a future version o

<?php
class Car
{
    var $color = "add";
    function Car($color="green") {
        $this->color = $color;
    }
    function what_color() {
        return $this->color;
    }
}

$car = new Car;
echo $car->what_color(),"<br>over";
?>

<?php
class Car
{
    public $color = "add";
    function __construct($color="green") {   //注意是双下划线
        $this->color = $color;
    }
    public function what_color() {
        return $this->color;
    }
}

$car = new Car("red");
echo $car->what_color(),"<br>over";
?>