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<?php 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; } } } $dataContainer = new DataContainer([1, 2, 3]); foreach (array_keys($dataContainer) as $key) { $dataContainer[$key] *= -1; } var_dump($dataContainer);
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Deprecated: Return type of & DataContainer::getIterator() should either be compatible with IteratorAggregate::getIterator(): Traversable, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/SOioP on line 11 Fatal error: Uncaught TypeError: array_keys(): Argument #1 ($array) must be of type array, DataContainer given in /in/SOioP:19 Stack trace: #0 /in/SOioP(19): array_keys(Object(DataContainer)) #1 {main} thrown in /in/SOioP on line 19
Process exited with code 255.
Output for 8.0.0 - 8.0.30
Fatal error: Uncaught TypeError: array_keys(): Argument #1 ($array) must be of type array, DataContainer given in /in/SOioP:19 Stack trace: #0 /in/SOioP(19): array_keys(Object(DataContainer)) #1 {main} thrown in /in/SOioP on line 19
Process exited with code 255.
Output for 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33
Warning: array_keys() expects parameter 1 to be array, object given in /in/SOioP on line 19 Warning: Invalid argument supplied for foreach() in /in/SOioP on line 19 object(DataContainer)#1 (1) { ["data":protected]=> array(3) { [0]=> int(1) [1]=> int(2) [2]=> int(3) } }
Output for 5.4.0 - 5.4.45
Parse error: syntax error, unexpected '$key' (T_VARIABLE) in /in/SOioP on line 13
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/SOioP 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/SOioP 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/SOioP on line 4
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/SOioP on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `'{'' in /in/SOioP on line 4
Process exited with code 255.
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