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run code in 150+ php & hhvm versions
Bugs & Features
<?php function debugPrintFilter() { return function(\Traversable $input) { foreach ($input as $in) { var_dump($in); yield $in; } }; } function fooFilter() { return function(\Traversable $input) { foreach ($input as $in) { yield "foo"; } }; } function upperCaseStringFilter() { return function(\Traversable $input) { foreach ($input as $in) { yield strtouppper($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; } } $p = (new FilterPipeline) ->src(new \ArrayIterator(["foo", "bar", "baz"])) ->pipe(upperCaseStringFilter()) ->pipe(debugPrintFilter()) ->pipe(fooFilter()); foreach ($p as $val) { var_dump("Output", $val); }
Output for 7.0.0 - 7.1.0
Fatal error: Uncaught Error: Call to undefined function strtouppper() in /in/lIEua:26 Stack trace: #0 /in/lIEua(6): {closure}(Object(ArrayIterator)) #1 /in/lIEua(16): {closure}(Object(Generator)) #2 /in/lIEua(69): {closure}(Object(Generator)) #3 {main} thrown in /in/lIEua on line 26
Process exited with code 255.
Output for 5.5.0 - 5.6.28
Fatal error: Call to undefined function strtouppper() in /in/lIEua on line 26
Process exited with code 255.
Output for 5.4.0 - 5.4.45
Parse error: syntax error, unexpected '$in' (T_VARIABLE) in /in/lIEua 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/lIEua on line 8
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/lIEua on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION in /in/lIEua on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/lIEua on line 5
Process exited with code 255.