Error Identifier: enumImplements.enum

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 Color
{
	case Red;
}

enum Shape implements Color
{
	case Circle;
}

Why is it reported? #

An enum uses implements to reference another enum instead of an interface. In PHP, enums can only implement interfaces. An enum cannot implement another enum.

How to fix it #

If both enums need to share a common contract, create an interface:

 <?php declare(strict_types = 1);
 
+interface HasLabel
+{
+	public function label(): string;
+}
+
-enum Color
+enum Color implements HasLabel
 {
 	case Red;
+
+	public function label(): string
+	{
+		return $this->name;
+	}
 }

-enum Shape implements Color
+enum Shape implements HasLabel
 {
 	case Circle;
+
+	public function label(): string
+	{
+		return $this->name;
+	}
 }

Non-ignorable error #

This error cannot be ignored using @phpstan-ignore or the ignoreErrors configuration. Non-ignorable errors indicate code that would cause a crash or a fatal error at runtime, or a fundamental problem in the analysed code that must be addressed.

Rules that report this error #

PHPStan\Rules\Classes\ExistingClassesInEnumImplementsRule [1]

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