<?php // Include config file require_once "config.php"; // Define variables and initialize with empty values $nameid = $address = $phone = ""; $nameid_err = $address_err = $phone_err = ""; // Processing form data when form is submitted if($_SERVER["REQUEST_METHOD"] == "POST"){ // Validate username if(empty(trim($_POST["nameid"]))){ $nameid_err = "Please enter your name."; } else{ // Prepare a select statement $sql = "SELECT id FROM borang WHERE nameid = ?"; if($stmt = mysqli_prepare($link, $sql)){ // Bind variables to the prepared statement as parameters mysqli_stmt_bind_param($stmt, "s", $param_nameid); // Set parameters $param_nameid = trim($_POST["nameid"]); // Attempt to execute the prepared statement if(mysql