3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function &gen_reference() { $data = [77,78,79]; foreach($data as $value ) { yield $value; } } foreach (gen_reference() as &$number) { echo $number *= -1,"\n"; } // Must unset $number ... foreach(gen_reference() as $number){ echo $number; }
Output for 5.5.0 - 5.6.28, 7.0.0 - 7.1.0
-77 -78 -79 777879
Output for hhvm-3.12.0
Fatal error: Uncaught Error: An iterator cannot be used with foreach by reference in /in/5Amo4:12 Stack trace: #0 {main}
Process exited with code 255.
Output for hhvm-3.10.0
Fatal error: An iterator cannot be used with foreach by reference in /in/5Amo4 on line 12
Process exited with code 255.
Output for 5.4.0 - 5.4.45
Parse error: syntax error, unexpected '$value' (T_VARIABLE) in /in/5Amo4 on line 6
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/5Amo4 on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/5Amo4 on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/5Amo4 on line 3
Process exited with code 255.