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<?php namespace Foo { class Bar { }; } namespace { use Foo\Bar; class_alias(Bar::class, 'FooBar'); class FooBar {}; class GuineaPig { public function withNamespace(Bar $bar) { echo sprintf("Passing %s worked with %s\n", get_class($bar), __METHOD__); } public function withoutNamespace(FooBar $bar) { echo sprintf("Passing %s worked with %s\n", get_class($bar), __METHOD__); } } $bar = new Bar(); $foobar = new FooBar(); $pig = new GuineaPig(); $pig->withNamespace($bar); $pig->withoutNamespace($foobar); $pig->withNamespace($foobar); $pig->withoutNamespace($bar); }
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Cannot declare class FooBar, because the name is already in use in /in/kBsXT on line 13 Passing Foo\Bar worked with GuineaPig::withNamespace Passing FooBar worked with GuineaPig::withoutNamespace Fatal error: Uncaught TypeError: GuineaPig::withNamespace(): Argument #1 ($bar) must be of type Foo\Bar, FooBar given, called in /in/kBsXT on line 35 and defined in /in/kBsXT:18 Stack trace: #0 /in/kBsXT(35): GuineaPig->withNamespace(Object(FooBar)) #1 {main} thrown in /in/kBsXT on line 18
Process exited with code 255.

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