Error Identifier: trait.duplicateProperty

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);

trait MyTrait
{
	public string $name;
	public int $name;
}

Why is it reported? #

A property is declared more than once in the same trait. PHP does not allow redeclaring properties within a single trait definition. This also applies when a property is declared both as a regular property and as a constructor-promoted property.

How to fix it #

Remove the duplicate property declaration:

 trait MyTrait
 {
 	public string $name;
-	public int $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\DuplicateDeclarationRule [1] [2]

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