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<?php $foo = function (string $bar = null ) { var_dump($bar); }; $foo(); $foo(null); $foo('foo'); $foo(100); $foo([100]);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
NULL NULL string(3) "foo" string(3) "100" Fatal error: Uncaught TypeError: {closure}(): Argument #1 ($bar) must be of type ?string, array given, called in /in/r25qn on line 10 and defined in /in/r25qn:2 Stack trace: #0 /in/r25qn(10): {closure}(Array) #1 {main} thrown in /in/r25qn on line 2
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 NULL NULL string(3) "foo" string(3) "100" Fatal error: Uncaught TypeError: {closure}(): Argument #1 ($bar) must be of type ?string, array given, called in /in/r25qn on line 10 and defined in /in/r25qn:2 Stack trace: #0 /in/r25qn(10): {closure}(Array) #1 {main} thrown in /in/r25qn on line 2
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
NULL NULL string(3) "foo" string(3) "100" Fatal error: Uncaught TypeError: Argument 1 passed to {closure}() must be of the type string or null, array given, called in /in/r25qn on line 10 and defined in /in/r25qn:2 Stack trace: #0 /in/r25qn(10): {closure}(Array) #1 {main} thrown in /in/r25qn on line 2
Process exited with code 255.
Output for 7.0.0 - 7.0.33
NULL NULL string(3) "foo" string(3) "100" Fatal error: Uncaught TypeError: Argument 1 passed to {closure}() must be of the type string, array given, called in /in/r25qn on line 10 and defined in /in/r25qn:2 Stack trace: #0 /in/r25qn(10): {closure}(Array) #1 {main} thrown in /in/r25qn on line 2
Process exited with code 255.
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
NULL NULL Catchable fatal error: Argument 1 passed to {closure}() must be an instance of string, string given, called in /in/r25qn on line 8 and defined in /in/r25qn on line 2
Process exited with code 255.

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