Pass a input value with url in php

I want to pass a input value with a url.

<div class="modal-body">
    <div id="myDiv" class="answer_list">
        <form action="" id="usrform" method="get">
            <textarea name="comment" style="width: 450px; height: 80px; form="usrform"></textarea>

   <?php echo '<a href="reject_request.php?leave_id='.$id1.'&emp_id='.$emp_id.'">'?>
   <button style="float: right" type="button"  class="btn btn-primary" name="submit">
        Proceed
    </button></a></form></div>
</div>

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Here I want to pass the textarea input value to 'reject_request.php' page with other variables. I couldn't able to find a way, Can any one help me !