html - How do I multiply values in PHP? -

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i trying find basic input user enters 1 number , second number , multiplies it.

i got work without isset function, trying echo out error line when page first starts up. if see input named, name , name2 call them in php. original code did not use isset , worked got error before input. php code:

<html>      <style>         <?php include 'style.css';?>     </style>     <body>          <form method="post">             <p> enter value 1:<input type="text" name="name"> <br>                 <p> enter value 2:<input type="text" name="name2"><br>             <input type="submit" value="send">         </form>           <br>         <h3>your input:</h3><br>  <?php  if (isset($_post['name'])) && (isset($_post['name2'])){     $num=$_post['name'];     $num2=$_post['name2'];     echo $num*$num2; }  else{     echo ''; }   ?>     </body> </html>

you have closed if parentheses soon. line should this:

if (isset($_post['name']) && isset($_post['name2'])) {

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