Online PHP editor | output for 0nRqM

@ 2013-08-01T09:42:52Z

<?php
// Everything you enter here will be executed by our servers. Try it!

function iterator_pipeline(\Traversable $source, array $steps)
{
    $gen = $source;

    foreach ($steps as $spec) {
        if (is_array($step) and !is_callable($spec)) {
            $g = array_shift($spec);
            array_unshift($spec, $gen);

            if (class_exists($g)) {
				$class = new \ReflectionClass($className);
            	$gen = $class->newInstanceArgs($spec);
            } else if (is_callable($g)) {
                $gen = call_user_func_array($g, $spec);
            }
        } else if (is_callable($spec)) {
            $gen = $spec($gen);
        }
    }

    return $gen;
}

function iterator_chunk(\Traversable $it, $chunkSize)
{
	$chunk = [];
    $steps = range(1, $chunkSize);

    while (true) {
        foreach ($steps as $_) {
			if (!$it->valid()) {
                break 2;
            }

			$chunk[] = $it->current();
			$it->next();
        }

        yield $chunk;
        $chunk = [];
    }

    if ($chunk) {
        yield $chunk;
    }
}

function iterator_consume(\Traversable $it)
{
    foreach ($it as $key => $value) {}
}

function iterator_pass(\Traversable $it) 
{
    foreach ($it as $key => $value) {
        yield $key => $value;
    }
}

function iterator_tee(\Traversable $source, array $drains)
{
    foreach ($source as $key => $value) {
        foreach ($drains as $gen) {
	        $gen->send($value);
        }

        yield $key => $value;
    }
}

$receiver = function () {
    for (;;) {
        echo "TEE:\n";
	    print_r((yield));
    }
};

$receiver2 = function () {
    for (;;) {
        echo "Received!\n";
        (yield);
    }
};

$steps = [
    function ($it) {
        foreach ($it as $val) {
            yield $val * 2;
        }
    },
    "iterator_pass",
	["iterator_chunk", 32],
    ["iterator_tee", [$receiver(), $receiver2()]]
];

$it = iterator_pipeline(new \ArrayIterator(range(0, 127)), $steps);

iterator_consume($it);

Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: Warning: Undefined variable $step in /in/0nRqM on line 9 Warning: Undefined variable $step in /in/0nRqM on line 9 Warning: Undefined variable $step in /in/0nRqM on line 9 Warning: Undefined variable $step in /in/0nRqM on line 9
Output for 5.5.0 - 5.5.36, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.12 - 7.3.31, 7.4.0 - 7.4.33: Notice: Undefined variable: step in /in/0nRqM on line 9 Notice: Undefined variable: step in /in/0nRqM on line 9 Notice: Undefined variable: step in /in/0nRqM on line 9 Notice: Undefined variable: step in /in/0nRqM on line 9
Output for 7.3.32 - 7.3.33
Output for 5.4.0 - 5.4.45: Parse error: syntax error, unexpected '$chunk' (T_VARIABLE) in /in/0nRqM on line 42
Process exited with code 255.
Output for 5.3.0 - 5.3.29: Parse error: syntax error, unexpected '[' in /in/0nRqM on line 29
Process exited with code 255.
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17: Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/0nRqM on line 4 Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/0nRqM on line 14 Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/0nRqM on line 27 Parse error: syntax error, unexpected '[' in /in/0nRqM on line 29
Process exited with code 255.
Output for 5.0.0 - 5.0.5: Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/0nRqM on line 4 Parse error: parse error, unexpected T_ARRAY, expecting '&' or T_VARIABLE in /in/0nRqM on line 4
Process exited with code 255.
Output for 4.4.2 - 4.4.9: Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/0nRqM on line 4 Parse error: syntax error, unexpected T_STRING, expecting ')' in /in/0nRqM on line 4
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: Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/0nRqM on line 4 Parse error: parse error, unexpected T_STRING, expecting ')' in /in/0nRqM on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/0nRqM on line 4 Parse error: parse error, expecting `')'' in /in/0nRqM on line 4
Process exited with code 255.

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