Error Identifier: enum.constructor

Every error reported by PHPStan has an error identifier. Here’s a list of all error identifiers. In PHPStan Pro you can see the error identifier next to each error and filter errors by their identifiers.

Code example #

<?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:

 <?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',
+        };
+    }
 }

How to ignore this error #

You can use the identifier enum.constructor to ignore this error using a comment:

// @phpstan-ignore enum.constructor
codeThatProducesTheError();

You can also use only the identifier key to ignore all errors of the same type in your configuration file in the ignoreErrors parameter:

parameters:
	ignoreErrors:
		-
			identifier: enum.constructor

Rules that report this error #

PHPStan\Rules\Classes\EnumSanityRule [1]

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