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<?php function toto($x,&$y = 3) { return $x + $y; } var_dump(toto(2, 3));
Output for 8.3.0 - 8.3.4
Fatal error: Uncaught Error: toto(): Argument #2 ($y) could not be passed by reference in /in/aSGnV:7 Stack trace: #0 {main} thrown in /in/aSGnV on line 7
Process exited with code 255.
Output for 8.1.23 - 8.1.27, 8.2.10 - 8.2.17
Fatal error: Uncaught Error: toto(): Argument #2 ($y) cannot be passed by reference in /in/aSGnV:7 Stack trace: #0 {main} thrown in /in/aSGnV on line 7
Process exited with code 255.
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.34
Fatal error: Only variables can be passed by reference in /in/aSGnV on line 7
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected '=', expecting ')' in /in/aSGnV 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
Parse error: parse error, unexpected '=', expecting ')' in /in/aSGnV on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/aSGnV on line 3
Process exited with code 255.

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