问题从MySQL变为MySQLi和mysqli_fetch_array语法

Question

我正在尝试将旧mysql代码更改为mysqli。我是两个新手，不知道我的mysqli_fetch_array声明有什么问题。

警告：mysqli_fetch_array（）期望参数1为mysqli_result，给定字符串

session_start(); // start session cookies

include("includes/vars.php");
include("includes/functions.php");
//default values for variables.
$logged_status ='';
$username = '';
$msg = '';
$co='';
$result='';

      $mycon=mysqli_connect("localhost","REDACTED","REDACTED","reinvest_auctions");

    if(isset($_REQUEST['co'])){
        $co=$_REQUEST['co'];
  }

 //Checks if there is a login cookie
  if(isset($_COOKIE['username']) && isset($_COOKIE['password'])){
   $_SESSION['username'] = $_COOKIE['username'];
   $_SESSION['password'] = $_COOKIE['password'];
 }
 //if  sessions set, call Db to check pwd
 if(isset($_SESSION['password']) && isset($_SESSION['username'])){

 $username = $_SESSION['username'];
 $password = $_SESSION['password'];
 $sql = "SELECT * FROM `members` WHERE c_email = $username";
 $check = mysqli_query($mycon, $sql);


 while($info = mysqli_fetch_array($result))
   {
    if ($password != stripslashes($info['c_password']))
      {
        clear();
    }
  else
  {
     redirect('home.php?co='.$co.'');
  }
 }
}