3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php class DataContainer implements IteratorAggregate { // create an external Iterator: protected $data; public function __construct(array $data) { $this->data = $data; } public function &getIterator() { /*foreach ($this->data as &$value) { yield $value; }*/ return new ArrayIterator($this); } } $dataContainer = new DataContainer([77, 78, 79]); foreach ($dataContainer as &$value) { echo $value *= -1,"\n"; }
Output for 7.1.0
Notice: Only variable references should be returned by reference in /in/XJI5W on line 13 Fatal error: Uncaught Exception: Objects returned by DataContainer::getIterator() must be traversable or implement interface Iterator in /in/XJI5W:18 Stack trace: #0 {main} thrown in /in/XJI5W on line 18
Process exited with code 255.
Output for 5.4.0 - 5.6.28, 7.0.0 - 7.0.14
Notice: Only variable references should be returned by reference in /in/XJI5W on line 13
Output for hhvm-3.12.0
Fatal error: Uncaught Error: An iterator cannot be used with foreach by reference in /in/XJI5W:20 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/XJI5W on line 20
Process exited with code 255.
Output for 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[', expecting ')' in /in/XJI5W on line 17
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_ARRAY, expecting '&' or T_VARIABLE in /in/XJI5W on line 5
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting '{' in /in/XJI5W on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting '{' in /in/XJI5W on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `'{'' in /in/XJI5W on line 2
Process exited with code 255.