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<?php function foo () { return 'foo'; } var_dump(call_user_func_array('foo', ['foo', 'bar']));
based on m2qmE
Output for 5.4.0 - 7.2.0
string(3) "foo"
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/uP04Q on line 7
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/uP04Q on line 7
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/uP04Q on line 7
Process exited with code 255.