Online PHP editor | output for fqDZV

@ 2013-12-01T16:17:52Z

<?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 FilterPipeline 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;
    }
}

$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 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/fqDZV on line 51 string(3) "FOO" string(6) "Output" string(3) "foo" string(3) "BAR" string(6) "Output" string(3) "foo" string(3) "BAZ" string(6) "Output" string(3) "foo"
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 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: string(3) "FOO" string(6) "Output" string(3) "foo" string(3) "BAR" string(6) "Output" string(3) "foo" string(3) "BAZ" string(6) "Output" string(3) "foo"
Output for 5.4.0 - 5.4.45: Parse error: syntax error, unexpected '$in' (T_VARIABLE) in /in/fqDZV 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/fqDZV 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/fqDZV 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/fqDZV on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error in /in/fqDZV on line 5
Process exited with code 255.

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