Online PHP editor | rfc for Pt82S

@ 2013-08-02T13:22:12Z

<?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 git.master, git.master_jit, rfc.property-hooks: string(24) "0,2,4,6,8,10,12,14,16,18"

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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