将常量赋给最终类并调用其常量

Question

I have the following code and I am using php 5.5.6

product.php

class product {

    const STATUS = status;

    function __construct(){}

    public function printStatus($status){
        echo $status;
    }
}

final class status {
    const BROKEN = "br";
    const AVAILABLE = "av";
}

index.php

include("product.php");

$pr = new product();
$st = product::STATUS;
$pr->printStatus($st::BROKEN);

The above code gives as an output br, which is the expected

index2.php

include("product.php");

$pr = new product();
$pr->printStatus(product::STATUS::BROKEN);

The above code gives the following error Parse error: syntax error, unexpected '::' (T_PAAMAYIM_NEKUDOTAYIM) in ... which means that line $pr->printStatus(product::STATUS::BROKEN);

Does anyone know why this is happening? Is there a php limitation?

Answer 1

The following code is wrong:

$pr->printStatus(product::STATUS::BROKEN);

You can't set a constant at runtime. Maybe it would be better you're using a variable in class product like:

public $STATUS = status::AVAILABLE;

Then you can do something like this:

<?php
include("product.php");

$pr = new product();
$pr->STATUS = status::BROKEN;
$pr->printStatus($pr->STATUS);
?>

With that you can set the STATUS of a product object whenever you want.