ZF2：如何实现自定义过滤器？

我已经使用 Zend Framework 2 几个星期了，尽管在线文档相当不完整，但我还是成功地构建了我的网站的初稿。

不幸的是，我在尝试实现 Zend\Filter\File\Rename 过滤器的自定义版本时陷入困境；在这里我总结一下我所做的事情：

1）在我的名为“Library”的模块中，创建了文件

src\Library\Filter\File\Rename.php

namespace Library\Filter\File;

use Traversable;
use Zend\Filter;
use Zend\Filter\Exception;
use Zend\Stdlib\ArrayUtils;

class Rename extends Filter\AbstractFilter {
    static $uploadDir = '/srv/default/htdocs/public/uploads/';

    public function filter($value) {
        do {
            $newname = md5(uniqid(time()));
        } while(file_exists(self::uploadDir . $newname);

        if (rename($value, self::uploadDir . $newname) !== true)
            throw new Exception\RuntimeException(sprintf("File '%s' could not be renamed. An error occurred while processing the file.", $value));

        return self::uploadDir . $newname;
    }
}

如您所见，非常简单。这是模块配置：

模块.config.php

<?php
    return array(
        'controllers' => array(
            // Invokables don't support dependencies
            'invokables'    => array(
                'myFileRename'    => 'Library\Filter\File\Rename',
            ),
    ));

而形式是：

[...]
    public function getInputFilterSpecification() {
        return array(
            'file' => array(
                'required'  => false,
                'filters'   => array(
                    // Custom Renamer
                    array('name' => 'myFileRename'),
                ),
            )
        );
    }
 }

?>

但这不起作用，因为我总是遇到异常：

Fatal error:  Uncaught exception 'Zend\ServiceManager\Exception\ServiceNotFoundException' with message 'Zend\ServiceManager\ServiceManager::get was unable to fetch or create an instance for myFileRename' in /srv/default/vendor/ZF2/library/Zend/ServiceManager/ServiceManager.php:420
Stack trace:
#0 /srv/default/vendor/ZF2/library/Zend/ServiceManager/AbstractPluginManager.php(108): Zend\ServiceManager\ServiceManager->get('myfilerename', true)
#1 /srv/default/vendor/ZF2/library/Zend/Filter/FilterChain.php(179): Zend\ServiceManager\AbstractPluginManager->get('myfilerename', NULL)
#2 /srv/default/vendor/ZF2/library/Zend/InputFilter/Factory.php(263): Zend\Filter\FilterChain->attachByName('myfilerename', Array)
#3 /srv/default/vendor/ZF2/library/Zend/InputFilter/Factory.php(171): Zend\InputFilter\Factory->populateFilters(Object(Zend\Filter\FilterChain), Array)
#4 /srv/default/vendor/ZF2/library/Zend/InputFilter/Factory.php(237): Zend\InputFilter\Factory->createInput(Array)
#5 /srv/default/vendor/ZF2/library/Zend/Form/Form.php(672) in /srv/default/vendor/ZF2/library/Zend/ServiceManager/ServiceManager.php on line 420

不幸的是，我在整个互联网上没有找到任何文章可以帮助我解决这个问题，即使将我的过滤器别名为工厂，我仍然会收到此错误：/我必须做什么？

您可以像加载控制器一样加载过滤器（因此，controller输入您的模块配置）。该过滤器有一个插件管理器，但对于此过滤器，您不需要插件管理器。过滤器插件管理器中也没有与 MVC 配置的链接。

最简单的方法是自己实例化过滤器。应该是这样的：

use Library\Filter\File\Rename as RenameFilter;

public function getInputFilterSpecification()
{
    return array(
        'file' => array(
            'required'  => false,
            'filters'   => array(
                new RenameFilter,
            ),
        )
    );
}