<?php$vt = mysqli_connect("localhost","DB_KULLANICIADI","DB_PASSWORD","DB_NAME");if (mysqli_connect_errno()){    echo "Failed to connect to MySQL: " . mysqli_connect_error();}mysqli_select_db($vt,"DB_NAME");if(isset($_POST['rapor_no'])){    $rapor_no = stripcslashes($_POST['rapor_no']);}$sql = "SELECT * FROM d_veriler where rapor_no='$rapor_no'";$conn = mysqli_query($vt, $sql);if($conn->num_rows > 0){    echo "daha önce eklenmiş";}else{    $e = mysqli_query($vt, "SQL SORGUSU");    if($e){        echo "başarıyla eklendi";    }else{        echo "eklenemedi";    }}?>