PHP Static variable to store an array of functions

Question

I am trying to store all the attribute predicates within a static array in PHP:

public static $attributeValidation = [
    "attribute1" => function ($value) {
        return is_bool($value);
    },"attribute2" => function ($value) {
        return is_int($value);
    },
];

I am getting this following error:

expression is not allowed as default field value.

The goal is to simplify attribute validation by using

$attributeValidation["attribute"]($someValue);

Is there a way to accomplish this without using a local/private variables?

Marcin Orlowski · Accepted Answer · 2017-10-03 23:36:29Z

4

Is there a way to accomplish this without using a local/private variables

Yes. Simply create static method which would return the array you need:

public static function getAttributeValidation(): array
{
   return [
       // populate your array as you like
       ...
   ];
}

and then in your code instead of SomeClass::$attributeValidation you will do SomeClass::getAttributeValidation() to get that array.

edited Oct 3, 2017 at 23:36

answered Oct 3, 2017 at 23:19

Marcin Orlowski

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