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Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.32, 8.2.0 - 8.2.28, 8.3.0 - 8.3.20, 8.4.1 - 8.4.6
NULL Fatal error: Uncaught TypeError: foo(): Argument #1 ($arg) must be of type stdClass, null given, called in /in/R8WYD on line 11 and defined in /in/R8WYD:5 Stack trace: #0 /in/R8WYD(11): foo(NULL) #1 {main} thrown in /in/R8WYD on line 5
Process exited with code 255.
Output for 5.6.4 - 5.6.30, 7.0.0 - 7.0.30, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33
NULL NULL
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.3
Fatal error: Default value for parameters with a class type hint can only be NULL in /in/R8WYD on line 5
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected T_CONST in /in/R8WYD on line 3
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_CONST in /in/R8WYD on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/R8WYD on line 3
Process exited with code 255.

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