In PHP template engine, Twig there are various inbuilt awesome filters using that anyone can write large apps in less no. of lines like<\/p>\n\n\n\n
{% for user in users %}\n\/\/write code based on user\n{% else %}\n\/\/you can add else condition in for array which will work is users is blank\n{% endfor %}\n<\/pre>\n\n\n\nand various others filter too but these are limited and various default PHP function are not available in Twig then how can we use those ? For those cases Twig provide ways so that you can add your custom filters\/ extension. I am going to show you how.<\/p>\n\n\n\n
First<\/strong> – Create your custom extension class extending class \\Twig_Extension <\/em><\/p>\n\n\n\n<?php \nnamespace Webkul\\DemoBundle\\Twig;\n\nclass DemoExtension extends \\Twig_Extension\n{\n \/\/here we will write code\n \/\/two functions are necessary\n \/\/ 1st - getFilters() where you declare all your custom extensions\n \/\/ 2nd - getName() for your Extension class name\n}<\/pre>\n\n\n\nIt’s basic requirement is to declare two functions getFilters() and getName() so we add those here. In getFilters() function we declare our all custom filters\/ extensions and in getName() function we add this class name (any name).<\/p>\n\n\n\n
<?php\nnamespace Webkul\\DemoBundle\\Twig;\n\nclass DemoExtension extends \\Twig_Extension\n{\n \/**\n * Here we declare our custom filter with their respective function\n *\/\n public function getFilters()\n {\n return array(\n new \\Twig_SimpleFilter('addslashes', array($this, 'addslashes')),\n new \\Twig_SimpleFilter('utf8_decode', array($this, 'utf8_decode')),\n new \\Twig_SimpleFilter('json_decode', array($this, 'json_decode')),\n new \\Twig_SimpleFilter('urldecode', array($this, 'urldecode')),\n \/\/here first urldecode is name which we use in twig and 2nd one is with refer to function written in this class\n );\n }\n\n \/**\n * add slash on string\n *\/\n public function addslashes($string)\n {\n return addslashes($string);\n }\n\n \/**\n * utf8 decode string\n *\/\n public function utf8_decode($string) {\n return utf8_decode($string);\n }\n \n \/**\n * json decode string\n *\/\n public function json_decode($string) {\n return json_decode($string);\n }\n \n \/**\n * urldecode string\n *\/\n public function urldecode($string) {\n return urldecode($string);\n }\n\n \/**\n * {@inheritdoc}\n *\/\n public function getName()\n {\n return 'twig_extension';\n }\n}\n\n?><\/pre>\n\n\n\nSo we created a class with various custom functions now we have to just notify Symfony about these filters\/ extensions. We do it after declaring this in our service.<\/p>\n\n\n\n
services:\n webkul.twig_extension:\n class: Webkul\\DemoBundle\\Twig\\DemoExtension\n tags:\n - { name: twig.extension }<\/pre>\n\n\n\nThat’s it our Custom filters\/ extensions are ready to use. We can use these like Twig default once.<\/p>\n\n\n\n
{{ \"Webkul's Awesome Symfony Twig Blog\"|addslashes }}<\/pre>\n\n\n\nFramework used – Symfony 2.7<\/p>\n","protected":false},"excerpt":{"rendered":"