html - Detect click on <button></button> via PHP -

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is there way detect click on html button in php, or need put form tag around element , make input submit button.

<button name="btnbottom" type="button"></button>  or  <form method="post" action="#"> <input type="submit" name="btnbottom" /> </form> 

thanks in advance.

php server-side language. if you'd tell server-side script clicks on html elements, have either submit form or use ajax.