<?php $depth = 0; spl_autoload_register(function ($class) use (&$depth) { $depth++; $indent = str_repeat('| ', $depth); echo $indent."$depth: $class\n"; if ($class == 'IFace') { interface IFace {} } elseif ($class == 'IFaceImplementor') { class IFaceImplementor implements IFace {} } elseif ($class == 'InterfaceOfMainParent') { interface InterfaceOfMainParent { public function methodForSecondaryLspCheck(): IFace; } } elseif ($class == 'MainParent') { abstract class MainParent implements InterfaceOfMainParent { public function methodForSecondaryLspCheck(): IFaceImplementor {} } } elseif ($class == 'Intermediate') { abstract class Intermediate extends MainParent {} } elseif ($class == 'Child1') { class Child1 extends Intermediate {} } elseif ($class == 'Child2') { class Child2 extends Intermediate {} } elseif ($class == 'EntrypointParent') { abstract class EntrypointParent { abstract public function methodForLspCheck1(): MainParent; abstract public function methodForLspCheck2(): MainParent; } } elseif ($class == 'Entrypoint') { class Entrypoint extends EntrypointParent { public function methodForLspCheck1(): Child1 {} public function methodForLspCheck2(): Child2 {} } } $depth--; }); class_exists(Entrypoint::class);