Collect data in modal Bootstrap and retrieve data from PHP at the same time (AJAX, PHP, MySql)

I receive data from a link and show them in a modal Bootstrap

page 1

       <a href="pagina" id="id" data-target="#edit-modal">Enlace</a>

page 2

      $('#edit-modal').on('show.bs.modal', function(e) {

                 var $modal = $(this),
                     esseyId = e.relatedTarget.id;

                  DatosGlobales = esseyId;

        $.ajax({
            type: 'POST',
            data: DatosGlobales,
            url: 'detalles.php?jsoncallback=?',
            success: function(data){

                $modal.find('.edit-content').html(DatosGlobales);      

            }

        });       

It works perfect. I just want to retrieve the details of details.php and show them in that same modal.

details.php

    $PostID=$_POST['esseyId'];

    $sql = "SELECT * FROM tabla WHERE id='".$PostID."' ";
    mysqli_set_charset($conexion, "ISO-8859-1"); 
    if(!$result = mysqli_query($conexion, $sql)) die();
    $cursos = array(); 
    while($row = mysqli_fetch_array($result)) 
    { 

    $nomEns        =$row['NomEns']; 

    $cursos[] = array('nomEns' => $nomEns);

    }   

    $json_string = json_encode($cursos);
    echo $_GET['jsoncallback'] . '(' . $json_string . ');';

How can I show the data returned by php? Any suggestions? Thank you.