Error Identifier: enum.duplicateValue

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 Priority: int
{
    case Low = 1;
    case Medium = 2;
    case High = 2;
    case Critical = 1;
}

Why is it reported? #

A backed enum has multiple cases with the same backing value. Each case in a backed enum must have a unique value. PHP enforces this constraint and will throw a fatal error at runtime if two cases share the same value. In this example, Low and Critical both have value 1, and Medium and High both have value 2.

How to fix it #

Assign unique values to each enum case:

 <?php declare(strict_types = 1);
 
 enum Priority: int
 {
     case Low = 1;
     case Medium = 2;
-    case High = 2;
-    case Critical = 1;
+    case High = 3;
+    case Critical = 4;
 }

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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