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<?php include("config.php"); if (! empty($_POST["paper_id"])) { $paper_id = trim($_POST["paper_id"]); $query = "SELECT paperid FROM ijpbe WHERE paperid = '$paper_id'"; $res = mysqli_query($conn,$query); $num = mysqli_num_rows($res); if($num>=1) { echo "<h4 style='color:red'>Paper Id Already Exist</h4>"; } }?>