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<?php namespace Foo; call_user_func(function (array &$ref) {}, 'not_an_array_variable');
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
Warning: Foo\{closure}(): Argument #1 ($ref) must be passed by reference, value given in /in/vNN9X on line 3 Fatal error: Uncaught TypeError: Foo\{closure}(): Argument #1 ($ref) must be of type array, string given in /in/vNN9X:3 Stack trace: #0 [internal function]: Foo\{closure}('not_an_array_va...') #1 /in/vNN9X(3): call_user_func(Object(Closure), 'not_an_array_va...') #2 {main} thrown in /in/vNN9X on line 3
Process exited with code 255.
Output for 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33
Warning: Parameter 1 to Foo\{closure}() expected to be a reference, value given in /in/vNN9X on line 3 Fatal error: Uncaught TypeError: Argument 1 passed to Foo\{closure}() must be of the type array, string given in /in/vNN9X:3 Stack trace: #0 [internal function]: Foo\{closure}('not_an_array_va...') #1 /in/vNN9X(3): call_user_func(Object(Closure), 'not_an_array_va...') #2 {main} thrown in /in/vNN9X on line 3
Process exited with code 255.
Output for 7.0.0 - 7.0.20
Warning: Parameter 1 to Foo\{closure}() expected to be a reference, value given in /in/vNN9X on line 3

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