comment écrire code javascript dans php

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 <form name="testForm" id="testForm"  method="POST"  >      <input type="submit" name="btn" value="submit" autofocus  onclick="return true;"/>  </form>  <?php     if(isset($_POST['btn'])){         echo "             <script type=\"text/javascript\">             var e = document.getElementById('testForm'); e.action='test.php'; e.submit();             </script>         ";      }   ?> 

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<?php $script = <<< JS  $(function() {    // js code goes here });  JS; ?> 

<script><?= $script ?></script> 

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$(document).ready(function() {    // some code here  });