How can I insert correctly with jquery html code next to php in a modal?

I want to insert within a modal a textfield with a button that picks up the value of this textfield when I click on the button, for this I am using jquery and I am inserting the html next to a if(isset($_POST["boton"])) in php to perform an action when the button is pressed. in this way:

 $(document).ready(function(){
 $('#ModifCo').click(function(){
     $('#inyeccion').html('<form method="post">'+
                     '<table>'+
                     '<tr>'+
                        '<td>Comision de la AFP &nbsp</td>'+
                     '<td><input type="number" name="txtComisionAFP"></td>'+
                     '</tr>'+
                     '<td><br><input type="submit" name="boton" id="boton" value="Insertar Datos" class=" btn btn-default"> <br> </td>'+
                     '</form>'+
                     '<?php'+
                        'if(isset($_POST["boton"]))'+ 
                        '$ComisionAFP= $_POST["txtComisionAFP"];'+
                        'require_once "AFP.php";'+
                        'require_once "UpdateDB.php";'+
                        '$afp= new AFP("","","",$ComisionAFP);'+
                        '$op= new Update();'+
                        '$op->UpdateComision($afp);'+ 
                     '</table>')
});

The problem arises here $op->UpdateComision($afp); since jquery does not detect the arrow - > and he sends it to me only as a text.

Well some suggestion. PS: I'm learning