Fatal error: Call to a member function fetch_array() on a non-object in E:\wamp\www\shop\index.php

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//出错代码

function fetchone($sql, $retult_type = MYSQLI_ASSOC)
{
    global $conn;
    $result = $conn->query($sql);
    $row = $result->fetch_array($retult_type);
    return $row;
}
//原因是$sql未被正确赋值，查询出错了