Introduce ForbiddenClassNameExtension for append additional forbidden…

src/Classes/ForbiddenClassNameExtension.php

@@ -0,0 +1,13 @@
+<?php declare(strict_types = 1);
+
+
+namespace PHPStan\Classes;
+
+
+interface ForbiddenClassNameExtension
+{
+	public const EXTENSION_TAG = 'phpstan.forbiddenClassNamesExtension';
+
+	/** @return array<string, string> */
+	public function getClassPrefixes(): array;
+}

src/Rules/ClassForbiddenNameCheck.php

@@ -2,6 +2,8 @@
 
 namespace PHPStan\Rules;
 
+use PHPStan\Classes\ForbiddenClassNameExtension;
+use PHPStan\DependencyInjection\Container;
 use function sprintf;
 use function str_starts_with;
 use function strpos;
@@ -16,18 +18,31 @@
 		'PHP-Scoper' => '_PhpScoper',
 	];
 
+	public function __construct(private Container $container)
+	{
+	}
+
 	/**
 	 * @param ClassNameNodePair[] $pairs
 	 * @return RuleError[]
 	 */
 	public function checkClassNames(array $pairs): array
 	{
+		$extensions = $this->container->getServicesByTag(ForbiddenClassNameExtension::EXTENSION_TAG);
+
+		$classPrefixes = array_merge(
+			self::INTERNAL_CLASS_PREFIXES,
+			...array_map(static function (ForbiddenClassNameExtension $extension): array {
+				return $extension->getForbiddenClassNames();
+			}, $extensions),
+		);
+
 		$errors = [];
 		foreach ($pairs as $pair) {
 			$className = $pair->getClassName();
 
 			$projectName = null;
-			foreach (self::INTERNAL_CLASS_PREFIXES as $project => $prefix) {
+			foreach ($classPrefixes as $project => $prefix) {
 				if (str_starts_with($className, $prefix)) {
 					$projectName = $project;
 					break;