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<?php $alias_list = []; $alias_autoloader = function($class_name) use (&$alias_list) { if (isset($alias_list[strtolower($class_name)])) { class_alias($alias_list[strtolower($class_name)], $class_name); return true; } }; $alias = function($from, $to) use (&$alias_list) { $alias_list[strtolower($to)] = $from; }; spl_autoload_register($alias_autoloader); class Foo { function test() { return get_class($this); } } $alias('Foo', 'Bar'); function hint_on_bar(Bar $bar) { return "worked"; } $b = new Foo; var_dump(hint_on_bar($b));
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Uncaught TypeError: hint_on_bar(): Argument #1 ($bar) must be of type Bar, Foo given, called in /in/7nn9U on line 39 and defined in /in/7nn9U:29 Stack trace: #0 /in/7nn9U(39): hint_on_bar(Object(Foo)) #1 {main} thrown in /in/7nn9U on line 29
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.7, 7.1.20, 7.2.6 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33
Fatal error: Uncaught TypeError: Argument 1 passed to hint_on_bar() must be an instance of Bar, instance of Foo given, called in /in/7nn9U on line 39 and defined in /in/7nn9U:29 Stack trace: #0 /in/7nn9U(39): hint_on_bar(Object(Foo)) #1 {main} thrown in /in/7nn9U on line 29
Process exited with code 255.
Output for 7.1.10

Process exited with code 137.
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Catchable fatal error: Argument 1 passed to hint_on_bar() must be an instance of Bar, instance of Foo given, called in /in/7nn9U on line 39 and defined in /in/7nn9U on line 29
Process exited with code 255.
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