Mysqli_query()期望参数1为mysqli，是否为null?令人困惑? [英] Mysqli_query() expects parameter 1 to be mysqli, null given? Confusing?

问题描述

  define('DB_HOST', 'localhost');
  define('DB_USER', '******');
  define('DB_PASSWORD', '************');
  define('DB_NAME', '***********');

 $dbc = mysqli_connect(DB_HOST, DB_USER, DB_PASSWORD, DB_NAME);


 class User {

 function checkUser($uid, $oauth_provider,$username,$email,$twitter_otoken,$twitter_otoken_secret) 
{
    $query = mysqli_query($dbc,"SELECT * FROM si_table WHERE oauth_uid = '$uid' and oauth_provider = '$oauth_provider'");
    $result = mysqli_fetch_array($query);
    if (!empty($result)) {
        # User is already present
    } else {
        #user not present. Insert a new Record
        $query = mysqli_query($dbc,"INSERT INTO si_table (oauth_provider, oauth_uid, user_name,email_id,twitter_oauth_token,twitter_oauth_token_secret) VALUES ('$oauth_provider', $uid, '$username','$email')") ;
        $query = mysqli_query($dbc,"SELECT * FROM si_table WHERE oauth_uid = '$uid' and oauth_provider = '$oauth_provider'");
        $result = mysqli_fetch_array($query);
        return $result;
    }
    return $result;
}



}

我收到此错误！我不知道为什么? mysqli_query()期望参数1为mysqli，在第14、15、20、21和22行中给出null！

I am getting this error! I don;t know why? mysqli_query() expects parameter 1 to be mysqli, null given in line 14,15,20,21 and 22!

推荐答案

在checkUser的开头添加global $dbc;.该变量未在函数范围内定义.

Add global $dbc; to the beginning of the checkUser. The variable is not defined in the function scope.

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