Craft a simple Collection class

<?php
/**
 * collection
 */
class Collection
{
    protected $items;
    public function __construct(array $items)
    {
        $this->items = $items;
    }
    public function make($items)
    {
        return new static($items);
    }
    public function map($transform)
    {
        return new static(array_map($transform, $this->items));
    }
    public function filter($criteria)
    {
        return new static(array_filter($criteria, $this->items));
    }
}
$hellos = [
    [
        'title'   => 'hello',
        'content' => 'this is hello world!',
    ],
    [
        'title'   => 'hello2',
        'content' => 'this is hello2 world!',
    ],
    [
        'title'   => 'hello3',
        'content' => 'this is hello3 world!',
    ],
];
$titleCollection = Collection::make($hellos)->map(
    function ($episode) {
        return $episode['title'];
    });
var_dump($titleCollection);

参考：https://boxueio.com/series/do-not-loop-again/ebook/114

Craft a simple Collection class

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作者: catherine

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