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@ 2013-12-01T16:14:40Z

<?php

function debugPrintFilter()
{
	return function(\Traversable $input) {
        foreach ($input as $in) {
        	var_dump($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 git.master, git.master_jit, rfc.property-hooks: 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/5EcYk on line 33 string(3) "foo" string(3) "bar" string(3) "baz"

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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