$preview_flag = 0;
$pk_id_student = 0;
if ($_GET['ACTION'] == 'EDIT' && isset($_GET['pk_id_planification_activity'])) {
    $proceso_editar = false;
    $data = array();
    $pk_id_actvity = $_GET['pk_id_planification_activity'];
    $attclass = new AttendanceClass($registry[$nameDataBase]);
    $data = $attclass->getListAttendanceClassByActivity($pk_id_actvity);
    if (count($data) > 0) {
        $proceso_editar = true;
    } else {
        $proceso_editar = false;
    }
}
$studentCourse = new AssignStudentCourseHard($registry[$nameDataBase]);
$list = $studentCourse->getListByCourseHard($_GET['PK_ID_COURSE_HARD']);
?>

<form id="course_data_form" method="POST" action="?page=course/take_care_admin&ACTION=INSERT&ENTITY=REGISTER&pk_id_actvity=<?php 
echo $pk_id_actvity;
?>
&PK_ID_COURSE_HARD=<?php 
echo $_GET['PK_ID_COURSE_HARD'];
?>
" enctype="multipart/form-data" >
<table class="form">

    <input type="hidden" name="ACTION" value="<?php 
echo $action;
?>
" >