如何創建一個symfony樹枝過濾器？

Question

例如，我的包名稱空間是Facebook\Bundle\FacebookBundle\Extension。

使用此如何創建樹枝擴展？

Answer 1

，您還可以通過使用getFunctions（）

class FacebookExtension extends Twig_Extension 
{ 
    public function getFunctions() 
    { 
     return array(
      'myFunction' => new Twig_Filter_Method($this, 'myFunction'), 
     ); 
    } 

    public function myFunction($arg1) 
    { 
     return $arg1; 
    } 

使用函數這樣創建樹枝功能：

{{ myFunction('my_param') }} 

Answer 2

這一切都在這裏：How to write a custom Twig Extension。

1.創建擴展：

// src/Facebook/Bundle/Twig/FacebookExtension.php 
namespace Facebook\Bundle\Twig; 

use Twig_Extension; 
use Twig_Filter_Method; 

class FacebookExtension extends Twig_Extension 
{ 
    public function getFilters() 
    { 
     return array(
      'myfilter' => new Twig_Filter_Method($this, 'myFilter'), 
     ); 
    } 

    public function myFilter($arg1, $arg2='') 
    { 
     return sprintf('something %s %s', $arg1, $arg2); 
    } 

    public function getName() 
    { 
     return 'facebook_extension'; 
    } 
} 

2.註冊一個支線的服務

# src/Facebook/Bundle/Resources/config/services.yml 
services: 
    facebook.twig.facebook_extension: 
     class: Facebook\Bundle\Twig\AcmeExtension 
     tags: 
      - { name: twig.extension } 

3.使用它

{{ 'blah'|myfilter('somearg') }} 

Answer 3

以來的Symfony的Twig_Filter_Method類棄用 2.1

請使用Twig_SimpleFilter class改爲如下示例所示：

的\ src \ Acme的\包\ CoreBundle \嫩枝\ DatetimeExtension.php

<?php 

namespace Acme\Bundle\CoreBundle\Twig; 

use Symfony\Component\DependencyInjection\ContainerInterface; 

class DatetimeExtension extends \Twig_Extension 
{ 
    /** 
    * @var \Symfony\Component\DependencyInjection\ContainerInterface 
    */ 
    private $container; 

    public function __construct(ContainerInterface $container) 
    { 
     $this->container = $container; 
    } 

    public function getFilters() 
    { 
     return array(
      'dateFormat' => new \Twig_SimpleFilter('dateFormat', array($this, 'dateFormat')), 
      'datetimeFormat' => new \Twig_SimpleFilter('datetimeFormat', array($this, 'datetimeFormat')) 
     ); 
    } 

    /** 
    * @param mixed $date 
    * @return string 
    */ 
    public function dateFormat($date) 
    { 
     $format = $this->container->getParameter('acme_core.date_format'); 
     return $this->format($date, $format); 
    } 

    /** 
    * @param mixed $date 
    * @return string 
    */ 
    public function datetimeFormat($date) 
    { 
     $format = $this->container->getParameter('acme_core.datetime_format'); 
     return $this->format($date, $format); 
    } 

    /** 
    * @param mixed $date 
    * @param string $format 
    * @throws \Twig_Error 
    * @return string 
    */ 
    private function format($date, $format) 
    { 
     if (is_int($date) || (is_string($date) && preg_match('/^[0-9]+$/iu', $date))) { 
      return date($format, intval($date, 10)); 
     } else if (is_string($date) && !preg_match('/^[0-9]+$/', $date)) { 
      return date($format, strtotime($date)); 
     } else if ($date instanceof \DateTime) { 
      return $date->format($format); 
     } else { 
      throw new \Twig_Error('Date or datetime parameter not valid'); 
     } 
    } 

    public function getName() 
    { 
     return 'datetime_extension'; 
    } 
} 

的\ src \ Acme的\包\ CoreBundle \資源\ CONFIG \ services.yml

services: 
    acme_core.twig.datetime_extension: 
     class: Acme\Bundle\CoreBundle\Twig\DatetimeExtension 
     arguments: [@service_container] 
     tags: 
      - { name: twig.extension } 

用例：

{{ value|datetimeFormat }} 

Symfony的文檔：http://symfony.com/doc/master/cookbook/templating/twig_extension.html

小枝文檔：http://twig.sensiolabs.org/doc/advanced.html#id3