mysqli_fetch_assoc() expects parameter 1 to be mysqli_result, boolean given in

Answer 1

use AND insted of comma (,) in query near password that's why query returning false and throw that error

$select = "SELECT id FROM loginregistration WHERE login ='".$login1."' and password ='".$password1."'";

UPDATE 1

if query fail it return false . so you can use mysqli_error($con); to know the error