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<?php
include("config.php");
if (! empty($_POST["paper_id"])) {
$paper_id = trim($_POST["paper_id"]);
$query = "SELECT paperid FROM ijnhs WHERE paperid = '$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>";
}
}?>