Detailed explanation of errors about PHP version number

<?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 version number

php 7.0.10

Reported Error

Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; Car has a deprecated constructor in E:\phpStorm\firstPhp\test.php on line 8

Solution

#Check the information and find## After #php7.0, the constructor with the same name as the class will no longer be supported, and the constructor method will uniformly use __construct().

##Corrected code##

<?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";
?>