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<?php function debugPrintFilter() { return function(\Traversable $input) { foreach ($input as $in) { print_r($in); yield $in; } }; } class FilterPipeline implements \IteratorAggregate { protected $filters = []; protected $src; function __construct() { } function src(\Traversable $it) { $this->src = $it; return $this; } function pipe(callable $filter) { array_push($this->filters, $filter); return $this; } function getIterator() { $it = $this->src; foreach ($this->filters as $filter) { $it = $filter($it); } return $it; } } $p = (new FilterPipeline) ->src(new \ArrayIterator(["foo", "bar", "baz"])) ->pipe(debugPrintFilter()); foreach ($p as $val) {}
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Deprecated: Return type of FilterPipeline::getIterator() should either be compatible with IteratorAggregate::getIterator(): Traversable, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/4YQWN on line 33 foobarbaz
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30
foobarbaz
Output for 5.4.0 - 5.4.45
Parse error: syntax error, unexpected '$in' (T_VARIABLE) in /in/4YQWN on line 8
Process exited with code 255.
Output for 5.3.0 - 5.3.29
Parse error: syntax error, unexpected T_VARIABLE in /in/4YQWN on line 8
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/4YQWN on line 5
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, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION in /in/4YQWN on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/4YQWN on line 5
Process exited with code 255.
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