//android.php
<?php
#models
require_once("models/User.php");

$json = json_decode(file_get_contents("php://input"));
$username = $json->username;
$password = $json->password;
$login = User::login_js($username,$password);

if($login == true) {
    echo 'true';
} else {
    echo 'false';
}

//User.php - model

        static function login_js($username,$pass) {
        $stmt = (new Database())->getConnection()->prepare("SELECT id FROM users WHERE login=? && pass=?");
        $stmt->execute(array($username, $pass));
        if (($temp = $stmt->fetch()) != false) {
            return true;
        }
        return false;
    }