Type hinting for properties in PHP 7?

Question

Does php 7 support type hinting for class properties?

I mean, not just for setters/getters but for the property itself.

Something like:

Answer 1

Edit for PHP 7.4 :

Since PHP 7.4 you can type attributes (Documentation / Wiki) which means you can do :

    class Foo
{
    protected ?Bar $bar;
    public int $id;
    ...
}

According to wiki, all acceptable values are :

• bool, int, float, string, array, object
• iterable
• self, parent
• any class or interface name
• ?type // where "type" may be any of the above

PHP < 7.4

It is actually not possible and you only have 4 ways to actually simulate it :

• Default values
• Decorators in comment blocks
• Default values in constructor
• Getters and setters

I combined all of them here

class Foo
{
    /**
     * @var Bar
     */
    protected $bar = null;

    /** 
    * Foo constructor
    * @param Bar $bar
    **/
    public function __construct(Bar $bar = null){
        $this->bar = $bar;
    }
    
    /**
    * @return Bar
    */
    public function getBar() : ?Bar{
        return $this->bar;
    }

    /**
    * @param Bar $bar
    */
    public function setBar(Bar $bar) {
        $this->bar = $bar;
    }
}

Note that you actually can type the return as ?Bar since php 7.1 (nullable) because it could be null (not available in php7.0.)

You also can type the return as void since php7.1