Online PHP editor | output for vbnPs

@ 2013-07-02T16:45:49Z

<?php

// thanks to metaultralurker on reddit for inspiration
 
function map(callable $fn, \Traversable $data) {
    foreach ($data as $v) {
        yield $fn($v);
    }
}
 
function filter(callable $fn, \Traversable $data) {
    foreach ($data as $v) {
        if ($fn($v)) {
            yield $v;
        }
    }
}
 
function infinite_range() {
    $i = 0;
    while (true) {
        yield $i++;
    }
}
 
function take($n, \Traversable $data) {
    $i = 0;
    foreach ($data as $v) {
        if ($i++ === $n) {
            break;
        }
 
        yield $v;
    }
}
 
function reduce(callable $fn, \Traversable $data, $runningTotal = null) {
    $first = true;
    foreach ($data as $v) {
        if (null === $runningTotal && $first) {
            $runningTotal = $v;
            continue;
        }
        $runningTotal = $fn($runningTotal, $v);
        $first = false;
    }
 
    return $runningTotal;
}
 
$isEven = function ($x) {
    return $x % 2 == 0;
};
 
$data = take(10, map('floatval', filter($isEven, infinite_range())));
 
/*
var_dump($data->current());
$data->next();
var_dump($data->current());
$data->next();
*/
 
// var_dump(iterator_to_array($data));
 
$concat = function ($sep, $a, $b) {
    return $a.$sep.$b;
};
 
$concatComma = function ($a, $b) use ($concat) {
    return $concat(',', $a, $b);
};
 
var_dump(reduce($concatComma, $data));

Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: string(24) "0,2,4,6,8,10,12,14,16,18"
Output for 5.4.0 - 5.4.45: Parse error: syntax error, unexpected '$fn' (T_VARIABLE) in /in/vbnPs on line 7
Process exited with code 255.
Output for 5.3.0 - 5.3.29: Parse error: syntax error, unexpected T_VARIABLE in /in/vbnPs on line 7
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/vbnPs on line 5 Parse error: syntax error, unexpected T_VARIABLE in /in/vbnPs on line 7
Process exited with code 255.
Output for 5.0.0 - 5.0.5: Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/vbnPs on line 5 Parse error: parse error, unexpected T_VARIABLE in /in/vbnPs on line 7
Process exited with code 255.
Output for 4.4.2 - 4.4.9: Parse error: syntax error, unexpected T_STRING, expecting ')' in /in/vbnPs 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: Parse error: parse error, unexpected T_STRING, expecting ')' in /in/vbnPs on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error, expecting `')'' in /in/vbnPs on line 5
Process exited with code 255.

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