Online PHP editor | rfc for I30Sb

@ 2014-09-25T14:23:46Z

<?php

namespace Enumerator;

use \ArrayIterator;
use \Traversable;

class Enumerable
{

    /**
     *
     * @var Traversable
     */
    private $traversable;

    /**
     *
     * @param Traversable|array $traversable
     * @return Enumerable
     */
    public static function enumerate($traversable)
    {
        return new Enumerable($traversable);
    }

    /**
     *
     * @param Traversable|array $traversable
     */
    public function __construct($traversable)
    {
        if ($traversable instanceof Traversable) {
            $this->traversable = $traversable;
        }
        else {
            $this->traversable = new ArrayIterator((array) $traversable);
        }
    }

    /**
     *
     * @param callable $callable
     * @return Enumerable
     */
    public function select(callable $callable)
    {
        $generator = function () use ($callable) {
            foreach ($this->traversable as $key => $value) {
                yield $key => $callable($value, $key);
            }
        };
        return new Enumerable($generator());
    }

    /**
     *
     * @param callable $callable
     * @return Enumerable
     */
    public function filter(callable $callable)
    {
        $generator = function () use ($callable) {
            foreach ($this->traversable as $key => $value) {
                if ($callable($value, $key)) {
                    yield $key => $value;
                }
            }
        };
        return new Enumerable($generator());
    }

    /**
     *
     * @return array
     */
    public function toArray()
    {
        return iterator_to_array($this->traversable);
    }

}

$array = Enumerable::enumerate([
    1, 6, 3, 8, 6, 1, 9, 4, 2, 4, 6, 4, 2,
])->select(function ($i) {
    echo sprintf('Selecting %d *  2', $i) . PHP_EOL;
    return $i * 2;
})->filter(function ($i) {
    echo sprintf('  Filtering %d > 10', $i) . PHP_EOL;
    return $i > 10;
})->select(function ($i) {
    echo sprintf('    Selecting %d * 3', $i) . PHP_EOL;
    return $i * 3;
})->filter(function ($i) {
    echo sprintf('      Filtering %d > 40', $i) . PHP_EOL;
    return $i > 40;
})->select(function ($i) {
    echo sprintf('        Selecting %d * 4', $i) . PHP_EOL;
    return $i * 3;
})->toArray();

var_dump($array);

Output for git.master, git.master_jit, rfc.property-hooks: Selecting 1 * 2 Filtering 2 > 10 Selecting 6 * 2 Filtering 12 > 10 Selecting 12 * 3 Filtering 36 > 40 Selecting 3 * 2 Filtering 6 > 10 Selecting 8 * 2 Filtering 16 > 10 Selecting 16 * 3 Filtering 48 > 40 Selecting 48 * 4 Selecting 6 * 2 Filtering 12 > 10 Selecting 12 * 3 Filtering 36 > 40 Selecting 1 * 2 Filtering 2 > 10 Selecting 9 * 2 Filtering 18 > 10 Selecting 18 * 3 Filtering 54 > 40 Selecting 54 * 4 Selecting 4 * 2 Filtering 8 > 10 Selecting 2 * 2 Filtering 4 > 10 Selecting 4 * 2 Filtering 8 > 10 Selecting 6 * 2 Filtering 12 > 10 Selecting 12 * 3 Filtering 36 > 40 Selecting 4 * 2 Filtering 8 > 10 Selecting 2 * 2 Filtering 4 > 10 array(2) { [3]=> int(144) [6]=> int(162) }

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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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