Convert this basic php function to codeigniter function inside a controller

[mfahryf]

Hello,
can anyone help me to convert this code (sendMessage.php) to a function inside a controller?

And this is the code for the view (index.php):

Home / Dashboard / wadagizig

<div class="col-md-4">
    <div class="box box-solid box-primary">
        <div class="box-header">
            <h4 class="box-title"><b>Telegram Message <i class="fa fa-send"></i></b></h4>
              </div>

        <div class="box-body">
    	<form method="post" action="sendMessage.php">
              <div class="form-group row">
                        <label class="col-md-4 col-form-label">Telegram ID</label>
                        <div class="col-md-8">
                        <input type="text" class="form-control" name="telegram_id" placeholder="Telegram ID">
                        </div>
                        </div>
              <div class="form-group row">
                        <label class="col-md-4 col-form-label">Messages</label>
                        <div class="col-md-8">
                        <input type="text" class="form-control" name="message_text" placeholder="Custom Text Message">
                        </div>
                        </div>
              <button type="submit" class="btn btn-primary pull-right">Send <i class="fa fa-send"></i></button>
        </form>
    </div>
</div>

Thank you.

[chorn]

<?php // Controller.php
class Controller {
   public function foobar(){
      //*** put everything in <?php ... ?> here (i won't write off of your pic)
   }
}