----------------- LOGIN & SIGNUP SCRIPTS --------------- <?php session_start(); $error=""; //error message variable for login error $error_signup=""; //error message variable for signup error // Create connection //$connection=mysqli_connect("<host address>","<database username>","<database password>","<database name>"); //<Example database details> $host="127.0.0.1"; $username="root"; $password=""; $db_name="motor_world"; $table_name="userinfo"; //connect to server and select database $connection=mysqli_connect("$host","$username","$password") OR die("cannot connect"); mysqli_select_db($connection,$db_name) OR die("cannot select database"); //-----------------Start of Login Script------------------- //if login button clicked o...