README

此包包含用于编写订阅源模型的代码。

安装

使用composer安装此包。

$ composer require widefocus/feed-writer

用法

此包旨在作为订阅源编写实现的基类。为此，需要实现一个编写器。

编写器

编写器处理订阅源数据。

<?php

use WideFocus\Feed\Writer\WriterInterface;
use WideFocus\Feed\Writer\WriterFieldInterface;
use WideFocus\Feed\Writer\WriterTrait;

class DebugWriter implements WriterInterface
{
    use WriterTrait;

    /**
     * @var WriterFieldInterface[]
     */
    private $fields;

    /**
     * Constructor.
     *
     * @param WriterFieldInterface[] $fields
     */
    public function __construct(array $fields)
    {
        $this->fields = $fields;
    }

    /**
     * Write an item to the feed.
     *
     * @param ArrayAccess $item
     *
     * @return void
     */
    protected function writeItem(ArrayAccess $item)
    {
        foreach ($this->fields as $field) {
            echo sprintf(
                "%s: %s\n",
                $field->getLabel(),
                $field->getValue($item)
            );
        }
    }

    /**
     * Initialize the feed.
     *
     * @return void
     */
    protected function initialize()
    {
    }

    /**
     * Finish the feed.
     *
     * @return void
     */
    protected function finish()
    {
    }
}

编写订阅源

编写器期望一个迭代器作为输入。迭代器应包含实现ArrayAccess接口的项目。

<?php

use WideFocus\Feed\Writer\WriterField;

$items = new ArrayIterator(
    [
        new ArrayObject(['foo' => 'FooValue', 'bar' => 'BarValue']),
        new ArrayObject(['foo' => 'AnotherFooValue', 'bar' => 'AnotherBarValue'])
    ]
);

$fields = [
    new WriterField('foo', 'Foo'),
    new WriterField('bar', 'Bar', 'strtoupper')
];

$writer = new DebugWriter($fields);
$writer->write($items);

这将导致以下输出

Foo: FooValue
Bar: BARVALUE
Foo: AnotherFooValue
Bar: ANOTHERBARVALUE