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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; } } } $dataContainer = new DataContainer([77, 78, 79]); foreach ($dataContainer as &$value) { echo $value *= -1,"\n"; } var_dump($dataContainer); // unset $value or can get strange bugs. //unset($value); foreach($dataContainer as $value); var_dump($dataContainer);
Output for 5.5.0 - 5.6.28, 7.0.0 - 7.1.0
-77 -78 -79 object(DataContainer)#1 (1) { ["data":protected]=> array(3) { [0]=> int(-77) [1]=> int(-78) [2]=> &int(-79) } } object(DataContainer)#1 (1) { ["data":protected]=> array(3) { [0]=> int(-77) [1]=> int(-78) [2]=> &int(-78) } }
Output for hhvm-3.12.0
Fatal error: Uncaught Error: An iterator cannot be used with foreach by reference in /in/indPp: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/indPp on line 20
Process exited with code 255.
Output for 5.4.0 - 5.4.45
Parse error: syntax error, unexpected '$value' (T_VARIABLE) in /in/indPp on line 11
Process exited with code 255.
Output for 5.1.0 - 5.3.29
Parse error: syntax error, unexpected T_VARIABLE in /in/indPp on line 11
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/indPp 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/indPp 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/indPp on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `'{'' in /in/indPp on line 2
Process exited with code 255.