Error Identifier: enum.serializable

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 implements \Serializable
{
    case Hearts;
    case Diamonds;

    public function serialize(): string
    {
        return $this->name;
    }

    public function unserialize(string $data): void
    {
    }
}

Why is it reported? #

PHP enums cannot implement the Serializable interface. This is a language-level restriction because enums have their own built-in serialization mechanism. Attempting to implement Serializable on an enum produces a fatal error.

How to fix it #

Remove the Serializable interface. Enums are serializable by default through PHP’s native mechanism:

 <?php declare(strict_types = 1);
 
-enum Suit implements \Serializable
+enum Suit
 {
     case Hearts;
     case Diamonds;
-
-    public function serialize(): string
-    {
-        return $this->name;
-    }
-
-    public function unserialize(string $data): void
-    {
-    }
 }

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\EnumSanityRule [1]

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