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<?php function test(array $array) { return !(bool)count(array_filter(array_keys($array), 'is_string')); } $arr = '0'; test($arr);
based on lQKdB
Output for 7.0.0 - 7.2.0
Fatal error: Uncaught TypeError: Argument 1 passed to test() must be of the type array, string given, called in /in/5Zs4U on line 7 and defined in /in/5Zs4U:3 Stack trace: #0 /in/5Zs4U(7): test('0') #1 {main} thrown in /in/5Zs4U on line 3
Process exited with code 255.
Output for 5.4.9 - 5.6.28
Catchable fatal error: Argument 1 passed to test() must be of the type array, string given, called in /in/5Zs4U on line 7 and defined in /in/5Zs4U on line 3
Process exited with code 255.
Output for 5.3.19 - 5.3.29
Catchable fatal error: Argument 1 passed to test() must be an array, string given, called in /in/5Zs4U on line 7 and defined in /in/5Zs4U on line 3
Process exited with code 255.