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<?php function test(&$v) { $v = $v + $v; } echo test(8);
Output for 8.3.0 - 8.3.6
Fatal error: Uncaught Error: test(): Argument #1 ($v) could not be passed by reference in /in/Tkb8G:8 Stack trace: #0 {main} thrown in /in/Tkb8G on line 8
Process exited with code 255.
Output for 8.1.23 - 8.1.28, 8.2.10 - 8.2.18
Fatal error: Uncaught Error: test(): Argument #1 ($v) cannot be passed by reference in /in/Tkb8G:8 Stack trace: #0 {main} thrown in /in/Tkb8G on line 8
Process exited with code 255.
Output for 5.4.18 - 5.4.19
Fatal error: Only variables can be passed by reference in /in/Tkb8G on line 8
Process exited with code 255.
Output for 5.3.0 - 5.3.27, 5.4.0 - 5.4.17
Fatal error: Only variables can be passed by reference in /in/L5CJP on line 8
Process exited with code 255.

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