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<?php function foo() : void {} var_dump(foo());
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
NULL
Output for 7.0.0 - 7.0.20
Fatal error: Uncaught TypeError: Return value of foo() must be an instance of void, none returned in /in/sUR8K:3 Stack trace: #0 /in/sUR8K(5): foo() #1 {main} thrown in /in/sUR8K on line 3
Process exited with code 255.
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Parse error: syntax error, unexpected ':', expecting '{' in /in/sUR8K on line 3
Process exited with code 255.

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