PHP Object-oriented code sharing for object-based traversal

The traversal of an object is the same as the traversal of an object, which refers to the traversal of an instance property .
　　
The properties that are traversed below are the "accessible attributes" in that scope (to consider access rights).

<?phpclass a{public    $p 1 = 1;        Protected $p 2 = 2;        Private $p 3 = 3;        Static $p 4 = 4;} $obj 1 = new A (), foreach ($obj 1 as $key = + $value) {//$key represents the object's properties, $value is its corresponding value    echo "<br/> Property $key:". $value 
 }?>

Operation Result:

Property P1:1

It is visible that only public-decorated properties can traverse, so how do you traverse all the properties of an object? Write a traversal method inside the class.

<?phpclass a{public    $p 1 = 1;        Protected $p 2 = 2;        Private $p 3 = 3;        Static $p 4 = 4;    static property    function Showallproperties () {        foreach ($this as $key = + $value) {                    echo "<br/> Property $key: $ Value ";          }}       } $obj 1 = new A (); $obj 1->showallproperties ();? >

Operation Result:

Property P1:1 Property P2:2 Property P3:3

However, static properties do not belong to the object, so they cannot be traversed.