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<?php class A { function aaa() { echo get_class($this); } } class B { function bbb() { A::aaa(); } } var_dump((new B())->bbb());
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 A::aaa() cannot be called statically in /in/QNeWc:11 Stack trace: #0 /in/QNeWc(15): B->bbb() #1 {main} thrown in /in/QNeWc on line 11
Process exited with code 255.
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
Deprecated: Non-static method A::aaa() should not be called statically in /in/QNeWc on line 11 Fatal error: Uncaught Error: Using $this when not in object context in /in/QNeWc:5 Stack trace: #0 /in/QNeWc(11): A::aaa() #1 /in/QNeWc(15): B->bbb() #2 {main} thrown in /in/QNeWc on line 5
Process exited with code 255.
Output for 7.3.32 - 7.3.33
Fatal error: Uncaught Error: Using $this when not in object context in /in/QNeWc:5 Stack trace: #0 /in/QNeWc(11): A::aaa() #1 /in/QNeWc(15): B->bbb() #2 {main} thrown in /in/QNeWc on line 5
Process exited with code 255.
Output for 7.0.0 - 7.0.20
Deprecated: Non-static method A::aaa() should not be called statically in /in/QNeWc on line 11 Notice: Undefined variable: this in /in/QNeWc on line 5 ANULL
Output for 5.6.0 - 5.6.28
Deprecated: Non-static method A::aaa() should not be called statically, assuming $this from incompatible context in /in/QNeWc on line 11 BNULL
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38
Strict Standards: Non-static method A::aaa() should not be called statically, assuming $this from incompatible context in /in/QNeWc on line 11 BNULL
Output for 4.4.2 - 4.4.9, 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/QNeWc on line 15
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, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_OBJECT_OPERATOR in /in/QNeWc on line 15
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/QNeWc on line 15
Process exited with code 255.

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