<?php
$servername = "localhost";
$username = "root";
$password = "l1j1p1s3rv3!";
$dbname = "demodb";
$fname=$_POST["fname"];
$lname=$_POST["lname"];

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}
$string="SELECT f_name,l_name FROM t_name WHERE f_name='$fname' AND l_name='$lname'";
$res=$conn->query($string);
if($res->num_rows==0){
$sql = "INSERT INTO t_name (f_name,l_name) VALUES ('$fname','$lname')";
if ($conn->query($sql) === TRUE) {
echo "New record created successfully";
} else {
 echo "Error: " . $sql . "<br>" . $conn->error;
} }
else
echo " Record already exists";
$conn->close();
?>