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<?php function f(&$x) {$x = 1;} f(@$x); echo $x;
Output for 8.3.0 - 8.3.6
Fatal error: Uncaught Error: f(): Argument #1 ($x) could not be passed by reference in /in/PmTnN:3 Stack trace: #0 {main} thrown in /in/PmTnN on line 3
Process exited with code 255.
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18
Fatal error: Uncaught Error: f(): Argument #1 ($x) cannot be passed by reference in /in/PmTnN:3 Stack trace: #0 {main} thrown in /in/PmTnN on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.11, 4.4.0, 5.0.0 - 5.0.5, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Fatal error: Only variables can be passed by reference in /in/PmTnN on line 3
Process exited with code 255.
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33
Notice: Only variables should be passed by reference in /in/PmTnN on line 3 Notice: Undefined variable: x in /in/PmTnN on line 4
Output for 5.1.0 - 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/PmTnN on line 3 Notice: Undefined variable: x in /in/PmTnN on line 4
Output for 4.4.1 - 4.4.9
Notice: Only variables can be passed by reference in /in/PmTnN on line 3 Notice: Undefined variable: x in /in/PmTnN on line 4
Output for 4.3.0 - 4.3.1
Fatal error: Only variables can be passed by reference in /in/PmTnN on line 3

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