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run code in 150+ php & hhvm versions
Bugs & Features
<?php // fr Nikita's RFC class DataContainer implements IteratorAggregate { protected $data; public function __construct(array $data) { $this->data = $data; } public function &getIterator() { foreach ($this->data as $key => &$value) { yield $key => $value; } } } $dataContainer = new DataContainer([1, 2, 3]); foreach ($dataContainer as &$value) { $value *= -1; } // $this->data is now [-1, -2, -3] foreach ($dataContainer as $value); var_dump($dataContainer);
Output for 5.5.24 - 5.6.28, 7.0.0 - 7.1.0
object(DataContainer)#1 (1) { ["data":protected]=> array(3) { [0]=> int(-1) [1]=> int(-2) [2]=> &int(-2) } }
Output for hhvm-3.12.0
Fatal error: An iterator cannot be used with foreach by reference in /in/iq5BU on line 21
Process exited with code 255.
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.4.0 - 5.4.45
Parse error: syntax error, unexpected '$key' (T_VARIABLE) in /in/iq5BU on line 13
Process exited with code 255.
Output for 5.1.0 - 5.3.29
Parse error: syntax error, unexpected T_VARIABLE in /in/iq5BU on line 13
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/iq5BU on line 7
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting '{' in /in/iq5BU on line 4
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/iq5BU on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `'{'' in /in/iq5BU on line 4
Process exited with code 255.