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Can someone please tell me how to fix this? here is the code function getPosts() { $posts = array(); $posts[0] = $_POST['course']; $posts[1] = $_POST['level']; $posts[2] = $_POST['section']; return $posts; } if (isset($_POST['insert'])) { $data = getPosts(); $existing_Query ="SELECT * FROM `class` WHERE `course`='$data[0]' OR `level`='$data[1]' OR `section`='$data[2]'"; $existing_Result = mysqli_query($con, $existing_Query); if(0 < mysqli_num_rows ($existing_Result)){ echo '<script type="text/javascript"> alert("your entry is already in the class. please choose another class."); window.location="addclass.php"; </script>'; } else { $insert_Query = "INSERT INTO `class` (`course`, `level`, `section`) VALUES ('$data[0]', '$data[1]', '$data[2]')"; $insert_Result = mysqli_query($con, $insert_Query); if ($insert_Result) { Thanks.