Custom functions making in Twig with Codeigniter 3 in PHP

 <?php defined('BASEPATH') or exit('No direct script access allowed');


class Welcome extends CI_Controller
{

    public function __construct()
    {
        parent::__construct();
        $this->load->helper("twig");
    }

    public function index()
    {
        $data = [
            'title' => 'Welcome to CodeIgniter with Twig',
            'message' => 'This is a sample page using Twig as the template engine.',
            "items" => array(
                array("name" => "Item 1", "description" => "This is item 1"),
                array("name" => "Item 2", "description" => "This is item 2"),
                array("name" => "Item 3", "description" => "This is item 3"),
            ),
            "heading1" => "Harry-ONE",
            "heading2" => "Harry-TWO",
            "heading3" => "Harry-THREE",
            "heading4" => "Harry-FOUR",
            "heading5" => "Harry-FIVE",
            "heading6" => "Harry-SIX",
            "paragraph1" => "This is Harry",
            "paragraph2" => "This is new paragraph",
            "paragraph3" => "Lorem ipsum dolor sit amet consectetur",
            "strong_text" => "This is strong",
            "paragraph4" => "adipisicing elit. Harum suscipit a sed magni excepturi nisi id, consequuntur at molestiae incidunt. Sunt harum,",
            "emphasized_text" => "This is Emphasized",
            "paragraph5" => "architecto vitae est soluta optio perspiciatis. Repudiandae, eveniet?",
            "paragraph6" => "Lorem ipsum, dolor sit amet consectetur adipisicing elit.",
            "paragraph7" => "At minima impedit, deleniti vero necessitatibus voluptatibus officiis dolorum voluptatum placeat harum fugiat repellendus vel consequatur porro possimus. Facilis pariatur consequatur accusantium!",
        ];

        $this->twig->render('welcome_message.twig', $data);
        $this->twig->render("Headings_Paragraphs.twig", $data);
    }
    
    public function operationFunction()
    {
        $data = [];
        $this->twig->render("operation_function.twig", $data);
    }
}






operation_function.twig
<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width">
        <title>addition Function</title>
    </head>
    <body>
        <h2>{{ additionFunction(5, 3) }}</h2>
        <h2>{{ subtractionFunction(15, 5) }}</h2>
        <h2>{{ multiplicationFunction(10, 20) }}</h2>
        <h2>{{ divisionFunction(30, 15) }}</h2>
    </body>
</html>






twig_helper.twig
<?php
defined("BASEPATH") or exit("No direct script access allowed");

function my_custom_function($param, $paramTwo)
{
    return "This is Twig function named my_custom_function: Hello " . $param . $paramTwo;
}
function additionFunction($arg1, $arg2)
{
    return "Addition of Two numbers 5 and 3 is : " . ($arg1 + $arg2);
}
function subtractionFunction($arg1, $arg2)
{
    return "Subtraction of Two numbers 15 and 5 is : " . ($arg1 - $arg2);
}
function multiplicationFunction($arg1, $arg2)
{
    return "Multiplication of Two numbers 10 and 20 is : " . ($arg1 * $arg2);
}
function  divisionFunction($arg1, $arg2)
{
    return "Division of Two numbers 30 and 15 is : " . ($arg1 / $arg2);
}







Twig.php
<?php defined('BASEPATH') or exit('No direct script access allowed');

require_once FCPATH  . 'vendor/autoload.php';

class Twig
{
    protected $CI;
    protected $twig;
    protected $loader;

    public function __construct()
    {
        $this->CI = &get_instance();

        $loader = new \Twig\Loader\FilesystemLoader(APPPATH . 'views');
        $this->twig = new \Twig\Environment($loader, [
            'cache' => APPPATH . 'cache/twig',
            'debug' => true,
        ]);

        if (ENVIRONMENT === 'development') {
            $this->twig->enableDebug();
            $this->twig->addExtension(new \Twig\Extension\DebugExtension());
        }

        // Register the custom function
        $this->registerCustomFunctions();
        $this->additionFunction();
        $this->subtractionFunction();
        $this->multiplicationFunction();
        $this->divisionFunction();
    }

    protected function registerCustomFunctions()
    {
        // Ensure the custom helper is loaded
        $this->CI->load->helper('twig');

        // Register the custom function
        $function = new \Twig\TwigFunction('my_custom_function', 'my_custom_function');
        $this->twig->addFunction($function);
    }

    public function additionFunction()
    {
        $function = new \Twig\TwigFunction("additionFunction", "additionFunction");
        $this->twig->addFunction($function);
    }

    public function subtractionFunction()
    {
        $function = new \Twig\TwigFunction("subtractionFunction", "subtractionFunction");
        $this->twig->addFunction($function);
    }

    public function multiplicationFunction()
    {
        $function = new \Twig\TwigFunction("multiplicationFunction", "multiplicationFunction");
        $this->twig->addFunction($function);
    }

    public function divisionFunction()
    {
        $function = new \Twig\TwigFunction("divisionFunction", "divisionFunction");
        $this->twig->addFunction($function);
    }

    public function render($template, $data = [])
    {
        echo $this->twig->render($template, $data);
    }
}



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