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@ 2013-07-01T10:26:30Z

<?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 git.master_jit, git.master, rfc.property-hooks: string(1) "A" string(1) "B" Fatal error: Uncaught Exception: Cannot rewind a generator that was already run in /in/MSoU3:44 Stack trace: #0 /in/MSoU3(44): iterator_to_array(Object(Generator)) #1 {main} thrown in /in/MSoU3 on line 44
Process exited with code 255.

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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