[Solved] MYSQL search result

Try to avoid posting same question in other ways, edit the same question.

You asked the same question in MYSQL OR not working

Hope this will really help you:-

try {
  $keyword = trim($_GET["keyword"]);
  if ($keyword <> "" ) {
    $sql = "SELECT * FROM tbl_contacts WHERE 1 AND "
            . " (first_name LIKE :keyword OR last_name LIKE :keyword) ORDER BY first_name ";
    $stmt = $DB->prepare($sql);

    $stmt->bindValue(":keyword", $keyword."%");
  }else {
    $sql = "SELECT * FROM tbl_contacts WHERE 1 ORDER BY first_name ";
    $stmt = $DB->prepare($sql);
  }

  $stmt->execute();
  $total_count = count($stmt->fetchAll());

I have also answered your new repeated question https://stackoverflow.com/a/44859408/7678788