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<?php class Foo { protected $label; public function __construct($label) { $this->label = $label; } } class Baz{} class Bar { public function test(Foo $foo = null) { if( is_null($foo) ) { $foo = new Foo('I am not magic.'); } var_dump($foo); } } $baz = new Bar(); $baz->test(new Foo('burp')); $baz->test(); $baz->test(new Baz());
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
object(Foo)#2 (1) { ["label":protected]=> string(4) "burp" } object(Foo)#2 (1) { ["label":protected]=> string(15) "I am not magic." } Fatal error: Uncaught TypeError: Bar::test(): Argument #1 ($foo) must be of type ?Foo, Baz given, called in /in/rc2qH on line 25 and defined in /in/rc2qH:14 Stack trace: #0 /in/rc2qH(25): Bar->test(Object(Baz)) #1 {main} thrown in /in/rc2qH on line 14
Process exited with code 255.
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 object(Foo)#2 (1) { ["label":protected]=> string(4) "burp" } object(Foo)#2 (1) { ["label":protected]=> string(15) "I am not magic." } Fatal error: Uncaught TypeError: Bar::test(): Argument #1 ($foo) must be of type ?Foo, Baz given, called in /in/rc2qH on line 25 and defined in /in/rc2qH:14 Stack trace: #0 /in/rc2qH(25): Bar->test(Object(Baz)) #1 {main} thrown in /in/rc2qH on line 14
Process exited with code 255.
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
object(Foo)#2 (1) { ["label":protected]=> string(4) "burp" } object(Foo)#2 (1) { ["label":protected]=> string(15) "I am not magic." } Fatal error: Uncaught TypeError: Argument 1 passed to Bar::test() must be an instance of Foo or null, instance of Baz given, called in /in/rc2qH on line 25 and defined in /in/rc2qH:14 Stack trace: #0 /in/rc2qH(25): Bar->test(Object(Baz)) #1 {main} thrown in /in/rc2qH on line 14
Process exited with code 255.
Output for 7.0.0 - 7.0.33
object(Foo)#2 (1) { ["label":protected]=> string(4) "burp" } object(Foo)#2 (1) { ["label":protected]=> string(15) "I am not magic." } Fatal error: Uncaught TypeError: Argument 1 passed to Bar::test() must be an instance of Foo, instance of Baz given, called in /in/rc2qH on line 25 and defined in /in/rc2qH:14 Stack trace: #0 /in/rc2qH(25): Bar->test(Object(Baz)) #1 {main} thrown in /in/rc2qH on line 14
Process exited with code 255.
Output for 5.6.0 - 5.6.40
object(Foo)#2 (1) { ["label":protected]=> string(4) "burp" } object(Foo)#2 (1) { ["label":protected]=> string(15) "I am not magic." } Catchable fatal error: Argument 1 passed to Bar::test() must be an instance of Foo, instance of Baz given, called in /in/rc2qH on line 25 and defined in /in/rc2qH on line 14
Process exited with code 255.

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