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<?php class A { private $str = "Pysh!.."; public function f() { B::g(); } } class B { private $str = "Ololo!.."; public function g() { print("I work!\n"); } } (new A)->f();
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
Fatal error: Uncaught Error: Non-static method B::g() cannot be called statically in /in/TcHRA:7 Stack trace: #0 /in/TcHRA(19): A->f() #1 {main} thrown in /in/TcHRA on line 7
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.31, 7.4.0 - 7.4.33
Deprecated: Non-static method B::g() should not be called statically in /in/TcHRA on line 7 I work!
Output for 7.3.32 - 7.3.33
I work!
Output for 5.6.8 - 5.6.28
Deprecated: Non-static method B::g() should not be called statically, assuming $this from incompatible context in /in/TcHRA on line 7 I work!
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35
Strict Standards: Non-static method B::g() should not be called statically, assuming $this from incompatible context in /in/TcHRA on line 7 I work!
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected T_OBJECT_OPERATOR in /in/TcHRA on line 19
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_OBJECT_OPERATOR in /in/TcHRA on line 19
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/TcHRA on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/TcHRA on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/TcHRA on line 4
Process exited with code 255.

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