php - WordPress - Select query on specific page -

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i want select query in specific page. created table in database:

enter image description here

first, added phpexec on plugin using php on page. then, tested select query , ok. finally, want create form checking serial number. here code:

<html> <head>     <title></title> </head> <body>     <form action="<?php echo $_server['php_self']; ?>" method="post"><br><br>        serial number: <input type="text" name="num1"><p>     <input type="submit" value="calculate">     </form> <phpcode>  <?php           if (count($_post) > 0 && isset($_post["num1"])         {             $servername = "localhost";             $username = "******";             $password = "*******";             $dbname = "******";             $serialnum = $_post["num1"];              // create connection             $conn = new mysqli($servername, $username, $password, $dbname);             // check connection             if ($conn->connect_error) {                 die("connection failed: " . $conn->connect_error);             }               $sql = "select install sn serial = $serialnum";             $result = $conn->query($sql);              if ($result->num_rows > 0) {                  while($row = $result->fetch_assoc()) {                     echo "id: " . $row["install"];                 }             } else {                 echo "no result";             }             $conn->close();         }  ?>  </phpcode> </body> </html>

actual output is:

enter image description here

how solve issue?

your form broken... try way

<form action="<?php echo $_server['php_self']; ?>" method="post"> <p>serial number: <input type="text" name="num1" value=""></p> <input type="submit" value="calculate"> </form>

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