$servername = "mysql8.000webhost.com";
$username = "removed";
$password = "removed";
$dbname = "removed";//I removed them cause, you know security matters hahaha


try {
    $connection = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
    $connection->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
}
catch(PDOException $e)
{
    die("OOPs something went wrong");
}

<?php

 if(isset($_POST['searchQuery']))
 {
        require_once('config.inc.php');
        $search_query=$_POST['searchQuery'];
      $sql = 'SELECT * from bookrecord where MATCH(bookTitle,bookAuthor,bookPublisher) AGAINST(:search_query)';
      $statement = $connection->prepare($sql);
        $statement->bindParam(':search_query', $search_query, PDO::PARAM_STR);
      $statement->execute();
      if($statement->rowCount())
      {
                $row_all = $statement->fetchall(PDO::FETCH_ASSOC);
                header('Content-type: application/json');
                echo json_encode($row_all);

      }
      elseif(!$statement->rowCount())
      {
             echo "no rows";
      }
 }

?>