PHP: Is it possible to use a static variable defined earlier in the same class definition?

Question

I have a php class like the following and got error saying invalid operation. I tried Sell::$a, self::$a and $this->a, Foo::$a, none of them worked. So I'm wondering if it's possible with PHP. I'm using php7.1. With Perl, there'd be no problems.

<?php

class Foo {
    public static $a = 1;

    public static $b = $a; /* want to assign $a to $b here */

    ...
}

Alberto · Accepted Answer · 2020-07-26 23:09:09Z

1

No, you can't, since PHP supports static initialization with literals and const expression.

You can't even use __get since

Member overloading only works in object context. These magic methods will not be triggered in static context. Therefore these methods can not be declared static.

answered Jul 26, 2020 at 23:09

Alberto

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2 Comments

Shiping Over a year ago

Thanks! I'd spent a hour or so trying to get it to work.

Alberto Over a year ago

@Shiping oh you're welcome, i love PHP but this is one of those cases where i can't understand why they are not implementing it (there are also several proposal for this)

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