enum.constructor - Phpstan

Code example

php

<?php declare(strict_types = 1);

enum Suit
{
    case Hearts;
    case Diamonds;

    public function __construct()
    {
    }
}

Why is it reported?

PHP enums cannot define a constructor. Enum cases are instantiated by PHP itself and are not meant to be created manually. Declaring a __construct method in an enum is a compile-time error.

How to fix it

Remove the constructor from the enum. If you need initialization logic, use a regular method instead:

diff-php

 <?php declare(strict_types = 1);

 enum Suit
 {
     case Hearts;
     case Diamonds;

-    public function __construct()
-    {
-    }
+    public function label(): string
+    {
+        return match($this) {
+            self::Hearts => 'Hearts',
+            self::Diamonds => 'Diamonds',
+        };
+    }
 }