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<?php class DataContainer implements IteratorAggregate { // create an external Iterator: protected $data; public function __construct(array $data) { $this->data = $data; } public function &getIterator() { echo 'automatically invoking ...'; foreach ($this->data as &$value) { yield $value; } } } $dataContainer = new DataContainer([77, 78, 79]); var_dump($dataContainer); 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 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Deprecated: Return type of & DataContainer::getIterator() should either be compatible with IteratorAggregate::getIterator(): Traversable, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/0QAsT on line 9 object(DataContainer)#1 (1) { ["data":protected]=> array(3) { [0]=> int(77) [1]=> int(78) [2]=> int(79) } } automatically invoking ...-77 -78 -79 object(DataContainer)#1 (1) { ["data":protected]=> array(3) { [0]=> int(-77) [1]=> int(-78) [2]=> &int(-79) } } automatically invoking ...object(DataContainer)#1 (1) { ["data":protected]=> array(3) { [0]=> int(-77) [1]=> int(-78) [2]=> &int(-78) } }
Output for 5.5.0 - 5.5.37, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30
object(DataContainer)#1 (1) { ["data":protected]=> array(3) { [0]=> int(77) [1]=> int(78) [2]=> int(79) } } automatically invoking ...-77 -78 -79 object(DataContainer)#1 (1) { ["data":protected]=> array(3) { [0]=> int(-77) [1]=> int(-78) [2]=> &int(-79) } } automatically invoking ...object(DataContainer)#1 (1) { ["data":protected]=> array(3) { [0]=> int(-77) [1]=> int(-78) [2]=> &int(-78) } }
Output for 5.4.0 - 5.4.45
Parse error: syntax error, unexpected '$value' (T_VARIABLE) in /in/0QAsT on line 12
Process exited with code 255.
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected T_VARIABLE in /in/0QAsT on line 12
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/0QAsT 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/0QAsT on line 2
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 T_STRING, expecting '{' in /in/0QAsT on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `'{'' in /in/0QAsT on line 2
Process exited with code 255.
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