function signIn() { $username = $_REQUEST['username']; $password = $_REQUEST['password']; include_once "../model/Seller.php"; $seller = new Seller(); if ($seller->signInShopkeeper($username, $password)) { echo '{"result": 1, "message": "Signed in successfully"}'; return; } echo '{"result": 0, "message": "Sign in was unsuccessful"}'; return; }