Online PHP editor | output for tTusL

@ 2013-07-01T10:25:49Z

<?php
 
// thanks to metaultralurker on reddit for inspiration
 
function call(callable $fn) {
    return $fn();
}
 
function map(callable $fn, \Traversable $data) {
    return call(function () use ($fn, $data) {
        foreach ($data as $v) {
            yield $fn($v);
        }
    });
}
 
function filter(callable $fn, \Traversable $data) {
    return call(function () use ($fn, $data) {
        foreach ($data as $v) {
            if ($fn($v)) {
                yield $v;
            }
        }
    });
}
 
$isNotZ = function ($x) {
    return $x !== 'Z';
};
 
$data = filter($isNotZ, map('strtoupper', call(function () {
    foreach (range('a', 'z') as $char) {
        yield $char;
    }
})));
 
/*
var_dump($data->current());
$data->next();
var_dump($data->current());
$data->next();
*/
 
var_dump(iterator_to_array($data));

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, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: array(25) { [0]=> string(1) "A" [1]=> string(1) "B" [2]=> string(1) "C" [3]=> string(1) "D" [4]=> string(1) "E" [5]=> string(1) "F" [6]=> string(1) "G" [7]=> string(1) "H" [8]=> string(1) "I" [9]=> string(1) "J" [10]=> string(1) "K" [11]=> string(1) "L" [12]=> string(1) "M" [13]=> string(1) "N" [14]=> string(1) "O" [15]=> string(1) "P" [16]=> string(1) "Q" [17]=> string(1) "R" [18]=> string(1) "S" [19]=> string(1) "T" [20]=> string(1) "U" [21]=> string(1) "V" [22]=> string(1) "W" [23]=> string(1) "X" [24]=> string(1) "Y" }
Output for 5.4.0 - 5.4.45: Parse error: syntax error, unexpected '$fn' (T_VARIABLE) in /in/tTusL on line 12
Process exited with code 255.
Output for 5.3.0 - 5.3.29: Parse error: syntax error, unexpected T_VARIABLE in /in/tTusL on line 12
Process exited with code 255.

preferences:dark modelive preview