Error Identifier: class.duplicate

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);

// file1.php
class UserService
{
	public function find(): void
	{
	}
}

// file2.php
class UserService
{
	public function find(): void
	{
	}
}

Why is it reported? #

The same class name is declared in multiple files within the analysed codebase. PHP does not allow two classes with the same fully-qualified name. If both files are loaded at runtime, a fatal error will occur. Even if only one is loaded at a time (e.g., via autoloading), having duplicate declarations is confusing and error-prone.

How to fix it #

Remove the duplicate declaration, or rename one of the classes:

 <?php declare(strict_types = 1);
 
 // file2.php
-class UserService
+class AdminUserService
 {
 	public function find(): void
 	{
 	}
 }

Or place the classes in different namespaces:

 <?php declare(strict_types = 1);
 
-// file2.php
-class UserService
+// file2.php
+namespace Admin;
+
+class UserService
 {
 	public function find(): void
 	{
 	}
 }

How to ignore this error #

You can use the identifier class.duplicate to ignore this error using a comment:

// @phpstan-ignore class.duplicate
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: class.duplicate

Rules that report this error #

PHPStan\Rules\Classes\DuplicateClassDeclarationRule [1]

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