Pass function in static variable of class PHP

Question

I have a class with static variable:

 class MyClass {
    protected static $rules = [
         'name' => 'required'
         'help' => 'required|in:' . implode(',', custom_helper_function());
    ];
 }

I want use custom helper function in this variable and use implode. How I can do it? Now I get error:

expression is not allowed as field default value

Thanks.

Well... as PHP lets you know, you can't, but [here's a possible workaround](https://stackoverflow.com/a/3312881/965834). — Jeto, Mar 27 '19 at 08:02
You cannot set the default value of member or class variables in php outside the constructor / function. This is why php is throwing this error. Move your initialization code to the constructor or other static class method. This is a similar issue to: https://stackoverflow.com/a/35037631/1345973 — Hichem BOUSSETTA, Mar 27 '19 at 08:04
@HichemBOUSSETTA that's not true. It's static so he want to use it without creating an instance of the class. — Elanochecer, Mar 27 '19 at 08:07
@Elanochecer yes I've just seen the variable is static. still, it cannot be initialized outside a function bloc. I updated my comment. thanks — Hichem BOUSSETTA, Mar 27 '19 at 08:08

score 0 · Answer 1 · answered Mar 27 '19 at 08:03

You cant use functions on variable definitions. If it was just a regular one i would suggest you to assign the value on the constructor, but being an static one then that's not possible/ makes no sense.

Then you just can't. Though you can achieve something similiar with an static function:

 class MyClass {

    public static function getRules() {
        $rules = [
         'name' => 'required',
         'help' => ( 'required|in:' . implode(',', custom_helper_function()) )
        ];
        return $rules;
    }
 }
 MyClass::getRules();

Also, don't forget to define the custom_helper_function.

Pass function in static variable of class PHP

1 Answers1