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<?php function a(&$p){ $p++; } a($x=18); var_dump($x);
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.1
int(19)
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.34
Fatal error: Uncaught Error: a(): Argument #1 ($p) cannot be passed by reference in /in/Pklt2:7 Stack trace: #0 {main} thrown in /in/Pklt2 on line 7
Process exited with code 255.
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Notice: Only variables should be passed by reference in /in/Pklt2 on line 7 int(18)
Output for 5.1.2 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Strict Standards: Only variables should be passed by reference in /in/Pklt2 on line 7 int(18)
Output for 8.3.0 - 8.3.35, 8.4.1 - 8.4.26, 8.5.0 - 8.5.11
Fatal error: Uncaught Error: a(): Argument #1 ($p) could not be passed by reference in /in/Pklt2:7 Stack trace: #0 {main} thrown in /in/Pklt2 on line 7
Process exited with code 255.

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