簡單的樹枝擴充套件 - Symfony 2.8

在建立任何擴充套件之前，請始終檢查它是否已經 實現 。

首先要做的是定義擴充套件類，它將容納樹枝過濾器和/或函式。

<?php

namespace AppBundle\Twig;

class DemoExtension extends \Twig_Extension {
    /**
     * A unique identifier for your application
     * 
     * @return  string
     */
    public function getName()
    {
        return 'demo';
    }

    /**
     * This is where one defines the filters one would to use in their twig 
     * templates
     * 
     * @return  Array
     */
    public function getFilters()
    {
        return array (
            new \Twig_SimpleFilter (
                'price',                      // The name of the twig filter
                array($this, 'priceFilter')   
            ),
        );
    }

    public function priceFilter($number, $decimals = 0, $decPoint = '.', $thousandsSep = ',')
    {
        return '$' . number_format($number, $decimals, $decPoint, $thousandsSep);
    }

    /**
     * Define the functions one would like availed in their twig template
     * 
     * @return  Array
     */
    public function getFunctions() {
        return array (
            new \Twig_SimpleFunction (
                'lipsum',                      // The name of the twig function
                array($this, 'loremIpsum')   
            )
        );
    }

    public function loremIpsum($length=30) {
        $string = array ();
        $words = array (
            'lorem',        'ipsum',       'dolor',        'sit',
            'amet',         'consectetur', 'adipiscing',   'elit',
            'a',            'ac',          'accumsan',     'ad',
            'aenean',       'aliquam',     'aliquet',      'ante',
            'aptent',       'arcu',        'at',           'auctor',
            'augue',        'bibendum',    'blandit',      'class',
            'commodo',      'condimentum', 'congue',       'consequat',
            'conubia',      'convallis',   'cras',         'cubilia',
            'cum',          'curabitur',   'curae',        'cursus',
            'dapibus',      'diam',        'dictum',       'dictumst',
            'dignissim',    'dis',         'donec',        'dui',
            'duis',         'egestas',     'eget',         'eleifend',
            'elementum',    'enim',        'erat',         'eros',
            'est',          'et',          'etiam',        'eu',
            'euismod',      'facilisi',    'facilisis',    'fames',
            'faucibus',     'felis',       'fermentum',    'feugiat',
            'fringilla',    'fusce',       'gravida',      'habitant',
            'habitasse',    'hac',         'hendrerit',    'himenaeos',
            'iaculis',      'id',          'imperdiet',    'in',
            'inceptos',     'integer',     'interdum',     'justo',
            'lacinia',      'lacus',       'laoreet',      'lectus',
            'leo',          'libero',      'ligula',       'litora',
            'lobortis',     'luctus',      'maecenas',     'magna',
            'magnis',       'malesuada',   'massa',        'mattis',
            'mauris',       'metus',       'mi',           'molestie'
        );

        for ( $i=0; $i<$length; $i++ )
            $string[] = $words[rand(0, 99)];

        return implode(" ", $string);
    }
}

然後，人們向服務容器警告新建立的枝條擴充套件。

# app/config/services.yml
services:
    app.twig.demo_extension:
        class: AppBundle\Twig\DemoExtension
        tags:
            - { name: twig.extension }

有了這個，你就擁有了在樹枝模板中使用新建立的樹枝過濾器或功能所需的一切

<p>Price Filter test {{ '5500' | price }}</p>
<p>{{ lipsum(25) }}</p>