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<?php $foo = function (integer $bar = null ) { var_dump($bar); }; $foo(); $foo(null); $foo(100); $foo('100'); $foo([100]);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Warning: "integer" will be interpreted as a class name. Did you mean "int"? Write "\integer" to suppress this warning in /in/ihMSH on line 2 NULL NULL Fatal error: Uncaught TypeError: {closure}(): Argument #1 ($bar) must be of type ?integer, int given, called in /in/ihMSH on line 8 and defined in /in/ihMSH:2 Stack trace: #0 /in/ihMSH(8): {closure}(100) #1 {main} thrown in /in/ihMSH on line 2
Process exited with code 255.
Output for 7.3.16 - 7.3.33, 7.4.0 - 7.4.33
NULL NULL Fatal error: Uncaught TypeError: Argument 1 passed to {closure}() must be an instance of integer or null, int given, called in /in/ihMSH on line 8 and defined in /in/ihMSH:2 Stack trace: #0 /in/ihMSH(8): {closure}(100) #1 {main} thrown in /in/ihMSH on line 2
Process exited with code 255.
Output for 7.1.0 - 7.1.20, 7.2.0 - 7.2.33
NULL NULL Fatal error: Uncaught TypeError: Argument 1 passed to {closure}() must be an instance of integer or null, integer given, called in /in/ihMSH on line 8 and defined in /in/ihMSH:2 Stack trace: #0 /in/ihMSH(8): {closure}(100) #1 {main} thrown in /in/ihMSH on line 2
Process exited with code 255.
Output for 7.0.0 - 7.0.20
NULL NULL Fatal error: Uncaught TypeError: Argument 1 passed to {closure}() must be an instance of integer, integer given, called in /in/ihMSH on line 8 and defined in /in/ihMSH:2 Stack trace: #0 /in/ihMSH(8): {closure}(100) #1 {main} thrown in /in/ihMSH on line 2
Process exited with code 255.
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
NULL NULL Catchable fatal error: Argument 1 passed to {closure}() must be an instance of integer, integer given, called in /in/ihMSH on line 8 and defined in /in/ihMSH on line 2
Process exited with code 255.

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