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<?php class Foo { public function bar(Bar $bar) { $bar->baz([$this, 'baz']); } protected function baz() { print 'Foobar!'.PHP_EOL; } } class Bar { public function baz(callable $baz) { $baz(); } } $foo = new Foo; $bar = new Bar; $foo->bar($bar);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
Fatal error: Uncaught TypeError: Bar::baz(): Argument #1 ($baz) must be of type callable, array given, called in /in/Gf0ul on line 4 and defined in /in/Gf0ul:13 Stack trace: #0 /in/Gf0ul(4): Bar->baz(Array) #1 /in/Gf0ul(21): Foo->bar(Object(Bar)) #2 {main} thrown in /in/Gf0ul on line 13
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33
Fatal error: Uncaught TypeError: Argument 1 passed to Bar::baz() must be callable, array given, called in /in/Gf0ul on line 4 and defined in /in/Gf0ul:13 Stack trace: #0 /in/Gf0ul(4): Bar->baz(Array) #1 /in/Gf0ul(21): Foo->bar(Object(Bar)) #2 {main} thrown in /in/Gf0ul on line 13
Process exited with code 255.
Output for 5.4.2 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28
Catchable fatal error: Argument 1 passed to Bar::baz() must be callable, array given, called in /in/Gf0ul on line 4 and defined in /in/Gf0ul on line 13
Process exited with code 255.

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