警告：mysqli_query（）期望參數1爲mysqli，字符串在C：\ xampp \ htdocs \ ecommerce \ server.php中的44行

-1

中給出。幫助..每當我提交數據時都會出現錯誤。警告：mysqli_query（）預計參數1是mysqli的，在C指定的字符串：\ XAMPP \ htdocs中\上線44 電子商務\ server.php這是我的代碼警告：mysqli_query（）期望參數1爲mysqli，字符串在C： xampp htdocs ecommerce server.php中的44行

<?php 
    $email = ""; 
    $firstname = ""; 
    $contact= ""; 
    $errors = array(); 
    // connect to the database 
    $db = mysqli_connect('localhost', 'root', '','registration'); 

    // if the register button is clicked 
    if (isset($_POST['register'])) { 

     $email = mysql_real_escape_string($_POST['email']); 
     $password_1 = mysql_real_escape_string($_POST['password_1']); 
     $password_2 = mysql_real_escape_string($_POST['password_2']); 
     $firstname = mysql_real_escape_string($_POST['firstname']); 
     $lastname = mysql_real_escape_string($_POST['lastname']); 
     $contact = mysql_real_escape_string($_POST['contact']); 

     // ensure that form field is filled properly 
     if (empty($email)) { 
      array_push($errors, "Email is required"); 
     } 

     if (empty($firstname)) { 
      array_push($errors, "Firstname is required"); 
     } 

     if (empty($contact)) { 
      array_push($errors, "Contact number is required"); 
     } 

     if (empty($password_1)) { 
      array_push($errors, "Password is required"); 
     } 

     if ($password_1 != $password_2) { 
      array_push($errors, "The two passwords do not match"); 
     } 
     // if there is no errors, save user to database 
     if (count($errors) == 0) { 
      $password = md5($password_1); //encrypt password before storing in database 
      $sql = "INSERT INTO users (email, password, firstname, lastname, contact) 
          VALUES ('$email', '$password', '$firstname', '$lastname', '$contact')"; 
      mysqli_query($sql, $db); 
     } 
    } 


?>

來源

2017-06-17 Jaymie Martin Dingle

混合'mysqli_ *'和'mysql_ *'真的是個壞主意。不要使用'mysql_ *'。'使用'mysqli_ *'''準備好的語句'並且從'SQL注入'保存自己。 –

md5也是可怕的練習 – rtfm

[mysqli \ _fetch \ _array（）/ mysqli \ _fetch \ _assoc（）/ mysqli \ _fetch \ _row（）期望參數1是資源或mysqli \ _result，布爾給定]（https://stackoverflow.com/questions/2973202/mysqli-fetch-array-mysqli-fetch-assoc- mysqli-fetch-row-expect-parameter-1） – mkaatman

請更改下面描述你的代碼。

mysqli_query($db,$sql);

請參考下面介紹的mysqli_query結構。

mysqli_query(Database_connection_object,mysql_query);

讓我知道它是否無效。

來源

2017-06-17 05:07:17

警告：mysqli_query（）期望參數1爲mysqli，字符串在C：\ xampp \ htdocs \ ecommerce \ server.php中的44行

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