how to write php code for the key press enter button when fill the form?

This is impossible with PHP. PHP is on the server.

Info about server side

Info about javascript client side scripting

Javascript can easily accomplish this for you. See this question

Like I said, this is impossible with PHP alone, here’s some php that echos the javascript.

In your section

echo '
<script type="text/javascript" language="javascript">
    function convertEnterToTab() {
      if(event.keyCode==13) {
        event.keyCode = 9;
    document.onkeydown = convertEnterToTab;    

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