my Form
    <form role="form" method="post">
              <div class="form-group">
                <label for="email">Email address:</label>
                <input type="text" class="form-control" id="email" name="email">
              </div>
              <div class="form-group">
                <label for="pwd">Password:</label>
                <input type="text" class="form-control" id="pwd">
              </div>

              <button type="button" class="btn btn-default" data-toggle="modal" data-target="#myModal" name="submit">Submit</button>
            </form>
my Modal
<!-- Modal -->
<div id="myModal" class="modal fade" role="dialog">
  <div class="modal-dialog">

    <!-- Modal content-->
    <div class="modal-content">
      <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal">&times;</button>
        <h4 class="modal-title">Modal Header</h4>
      </div>
      <div class="modal-body">
        <p>Some text in the modal.</p>
            <?php 

               === i want to retreive the value of textboxes in my form ====
            ?>
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
      </div>
    </div>

  </div>
</div>
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