Twig is a the flexible, fast, and secure PHP template engine.
I started using twig since i found this in symfony2.
I was trying to use split function of php in twig but i was not able to split a text.
So i started to implement twig filter. In this tutorial I’m going to make a simple Twig extension.
First we have to write a twig extension.
Step 1: Create a Extension Folder in the Bundle
Step 2: Create a php file in Extension Folder called MyTwigExtension.php
Source Code
<?php
// DevDreamBundle/Extension/MyTwigExtension.php
namespace Dev\DreamBundle\Extension;
class MyTwigExtension extends \Twig_Extension {
public function getFilters() {
return array(
'var_dump' => new \Twig_Filter_Function('var_dump'),
'highlight' => new \Twig_Filter_Method($this, 'highlight'),
'split' => new \Twig_Filter_Method($this, 'split'),
'countArray' => new \Twig_Filter_Method($this, 'countArray'),
);
}
public function highlight($sentence, $expr)
{
return preg_replace('/(' . $expr . ')/',
'<span style="color:red">\1</span>', $sentence);
}
public function split($sentence, $expr)
{
return explode($expr, $sentence);
}
public function countArray($sentence)
{
return count($sentence);
}
public function getName()
{
return 'my_twig_extension';
}
}
?>
Now we have to make a dependency injection. So we have to write a simple class that specifies what exactly our bundle needs, what services does it provide and eventualy configure our bundle.
Step 1: Create a DependencyInjection Folder in the Bundle
Step 2 : Make a php file called it hello Extension.php
Source Code
<?php
namespace Dev\DreamBundle\DependencyInjection;
use Symfony\Component\HttpKernel\DependencyInjection\Extension;
use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\DependencyInjection\Definition;
class HelloExtension extends Extension
{
public function load(array $config, ContainerBuilder $container)
{
$definition = new Definition
('Bundle\HelloBundle\Extension\MyTwigExtension');
// this is the most important part. Later in the startup process TwigBundle
// searches through the container and registres all services taged as twig.extension.
$definition->addTag('twig.extension');
$container->setDefinition('my_twig_extension', $definition);
}
/**
* Was necessary in previous Symfony2 PR releases.
* Symfony2 calls `load` method automatically now.
*
* public function getAlias() {
* return 'hello'; // that's how we'll call this extension in configuration files
* }
*/
}
?>
Now we have to just enable this twig. To do this
The Steps are :-
Open config.yml
# app/config/config.yml
services:
foo.twig.extension:
class: Dev\DreamBundle\Extension\HelloExtension
tags:
- { name: twig.extension }
Now You are good to go
Its time to use this extension in Twig
{{ ‘Dev Dream Live the life the way you want’|Split(‘ ‘)|raw }}
Output
It will create a array and split every word.
