Online PHP editor | rfc for Nf93P

@ 2013-12-01T16:19:37Z

<?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 $in) {
            yield strtoupper($in);
        }
    };
}

class Pipeline implements \IteratorAggregate {
    protected $filters = [];
    protected $src;

    function __construct()
    {
    }

    function src(\Traversable $it)
    {
        $this->src = $it;
        return $this;
    }

    function pipe(callable $filter)
    {
        $this->filters[] = $filter;
        return $this;
    }

    function getIterator()
    {
        $it = $this->src;

        foreach ($this->filters as $filter) {
            $it = $filter($it);
        }

        return $it;
    }

    function run()
    {
        foreach($this as $it) {}
        return $this;
    }
}

$p = (new Pipeline)
    ->src(new \ArrayIterator(["foo", "bar", "baz"]))
    ->pipe(upperCaseStringFilter())
    ->pipe(debugPrintFilter())
	->pipe(fooFilter())
    ->pipe(debugPrintFilter())
    ->run();

Output for git.master, git.master_jit, rfc.property-hooks: Deprecated: Return type of Pipeline::getIterator() should either be compatible with IteratorAggregate::getIterator(): Traversable, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/Nf93P on line 51 string(3) "FOO" string(3) "foo" string(3) "BAR" string(3) "foo" string(3) "BAZ" string(3) "foo"

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2020-03-21 RFC: Is_Literal - declined
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2016-04-19 Lexical scope support for anonymous classes - suspended
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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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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