mysql和mysqli的问题答案

【问题标题】：Problems with mysql and mysqlimysql和mysqli的问题
【发布时间】：2018-05-17 10:29:22
【问题描述】：

警告：mysqli_real_escape_string() 需要 2 个参数，1 在第 49 行的 C:\xampp\htdocs\swift\core\functions\general.php 中给出

注意：未定义变量：conn in C:\xampp\htdocs\swift\core\functions\users.php 在第 85 行

警告：mysqli_query() 期望参数 1 为 mysqli，给定 null 在第 85 行的 C:\xampp\htdocs\swift\core\functions\users.php 中

致命错误：未捕获错误：调用未定义函数 C:\xampp\htdocs\swift\core\functions\users.php:86 中的 mysqli_result() 堆栈跟踪：#0 C:\xampp\htdocs\swift\loginact.php(14): f_exists('') #1 {main} 在第 86 行的 C:\xampp\htdocs\swift\core\functions\users.php 中抛出

我不断收到这些错误，但我找不到方法，我已经尝试了所有方法。希望有人可以帮助我，因为我是 php 新手。我已经这样做了差不多一天了，我想不出答案。

这是General.php。

<?php

     $connect_error = 'Sorry, there was some connectivity issue!';
    $conn = mysqli_connect('localhost','root','');
    $db = mysqli_select_db($conn, 'swift');


    function activation($to, $subject, $body) {
        mail($to, $subject, $body, 'From: swift@srikanthnatarajan.com');
    }

    function recovery_user_pass($to, $subject, $body) {
        mail($to, $subject, $body, 'From: swift@srikanthnatarajan.com');
    }

    function f_protect_page() {
        if(f_logged_in() === false) {
            header('Location: flogin.php');
            exit();     
        } 
    }

    function user_protect_page() {
        if(f_logged_in() === false) {
            header('Location: fprotect.php');
            exit();     
        } 
    }

    function use_protect_page() {
        if(f_logged_in() === true) {
            header('Location: fprotect.php');
            exit();     
        } 
    }

    function f_logged_in_redirect() {
        if(f_logged_in() === true) {
            header('Location: index.php');
            exit();
        }
    }

    function array_sanitize($item) {
        $item = htmlentities(strip_tags(mysqli_real_escape_string($item)));
    }

    function sanitize($data) {
        return htmlentities(strip_tags(mysqli_real_escape_string($data)));
    }

    function output_errors($errors) {
        return '<ul><li>' . implode('</li><li>', $errors) . '</li></ul>';
    }

?>

这是 USERS.PHP 有人可以检查一下吗。

<?php

$connect_error = 'Sorry, there was some connectivity issue!';
    $conn = mysqli_connect('localhost','root','');
    $db = mysqli_select_db($conn, 'swift');



    function f_recover($mode, $f_mailid) {
        $mode = sanitize($mode);
        $f_mailid = sanitize($f_mailid);
        $f_data = f_data(f_id_from_email($f_mailid),'f_id','f_fname','f_uname');
        if ($mode == 'f_uname') {
            recovery_user_pass($f_mailid, 'Recovery: Your username', "Hello " . $f_data['f_fname'] . ",\n\nYour username is: " . $f_data['f_uname'] . "\n\n-Swift Airlines");
        }
        else if($mode == 'f_password') {
            $generated_password = substr(md5(rand(999, 999999)), 0, 8);
            f_change_password($f_data['f_id'], $generated_password);

            update_f($f_data['f_id'], array('f_passrec' => '1'));

            recovery_user_pass($f_mailid, 'Recovery: Your password', "Hello " . $f_data['f_fname'] . ",\n\nYour new password is: " . $generated_password . "\n\n-TOFSIS");
        }
    }

    function f_activate($f_mailid, $f_mailcode) {
        $f_mailid = mysqli_real_escape_string($_POST['f_mailid']);
        $f_mailcode = mysqli_real_escape_string($_POST['f_mailcode']);
        if(mysqli_result(mysqli_query("SELECT COUNT(`f_id`) FROM `flight_users` WHERE `f_mailid` = '$f_mailid' AND `f_mailcode` = '$f_mailcode' AND `f_active` = 0"), 0) == 1) {
            mysqli_query("UPDATE `flight_users` SET `f_active` = 1 WHERE `f_mailid` = '$f_mailid' ");
            return true;
        }
        else {
            return false;
        }
    }

    function update_f($f_id, $update_data) {
        $update = array();
        array_walk($update_data, 'array_sanitize');
        foreach ($update_data as $field => $data) {
            $update[] = '`' . $field . '` = \'' . $data . '\'';
        }       
        mysqli_query("UPDATE `flight_users` SET " . implode(', ',$update) . "WHERE `f_id` = $f_id") or die(mysqli_error($conn));
    }

    function f_change_password($f_id, $f_password) {
        $f_id = (int)$f_id;
        $f_password = md5($f_password);
        mysqli_query("UPDATE `flight_users` SET `f_password` = '$f_password', `f_passrec` = 0 WHERE `f_id` = $f_id");
    }

    function register_f($register_data) {
        array_walk($register_data, 'array_sanitize');
        $register_data['f_fname'] = ucwords(strtolower($register_data['f_fname']));
        $register_data['f_lname'] = ucwords(strtolower($register_data['f_lname']));
        $register_data['f_password'] = md5($register_data['f_password']);
        $register_data['f_uname'] = strtolower($register_data['f_uname']);
        $fields = '`' . implode('`, `', array_keys($register_data)) . '`';
        $data = '\'' . implode('\', \'', $register_data) . '\'';

        mysqli_query("INSERT INTO `flight_users` ($fields, `f_regdate`) VALUES ($data, NOW())");
        activation($register_data['f_mailid'], 'Swift Airlines: Activate your account', "Hello " . $register_data['f_fname'] . ", \n\nYou need to activate your account in order to use the features of Swift Airlines. Please click the link below: \n\nhttp://srikanthnatarajan.com/swift/activate.php?f_mailid=" . $register_data['f_mailid'] . "&f_mailcode=" . $register_data['f_mailcode'] . " \n\n-Swift Airlines");
    }

    function f_data($f_id){
        $data = array();
        $f_id = (int)$f_id;
        $func_num_args = func_num_args();
        $func_get_args = func_get_args();
        if($func_num_args > 1) {
            unset($func_get_args[0]);
            $fields = '`'. implode('`, `', $func_get_args) . '`'; 
            $data = mysqli_fetch_assoc(mysqli_query("SELECT $fields FROM `flight_users` WHERE `f_id` = $f_id"));            
            return $data;
        }
    }

    function f_logged_in() {
        return (isset($_SESSION['f_id'])) ? true : false;
    }

    function f_exists($f_uname) {
        $f_uname = sanitize($f_uname);
        $query = mysqli_query($conn, "SELECT COUNT(`f_id`) FROM `flight_users` WHERE `f_uname`= '$f_uname'");
        return (mysqli_result($conn, $query, 0) == 1) ? true : false; 
    }

    function f_email_exists($f_mailid) {
        $f_mailid = sanitize($f_mailid);
        $query = mysqli_query($conn, "SELECT COUNT(`f_id`) FROM `flight_users` WHERE `f_mailid`= '$f_mailid'");
        return (mysqli_result($conn, $query, 0) == 1) ? true : false; 
    }

    function f_regid_exists($f_regid) {
        $f_regid = sanitize($f_regid);
        $query = mysqli_query($conn, "SELECT COUNT(`f_id`) FROM `flight_users` WHERE `f_regid`= '$f_regid'");
        return (mysqli_result($conn, $query, 0) == 1) ? true : false; 
    }

    function f_active($f_uname) {
        $f_uname = sanitize($f_uname);
        $query = mysqli_query($conn, "SELECT COUNT(`f_id`) FROM `flight_users` WHERE `f_uname`= '$f_uname' AND `f_active` = 1");
        return (mysqli_result($conn, $query, 0) == 1) ? true : false; 
    }

    function f_id_from_username($f_uname) {
        $f_uname = sanitize($f_uname);
        $query = mysqli_query($conn, "SELECT `f_id` FROM `flight_users` WHERE `f_uname` = '$f_uname'");
        return mysqli_result($conn, $query, 0, 'f_id');
    } 

    function f_id_from_email($f_mailid) {
        $f_mailid = sanitize($f_mailid);
        $query = mysqli_query($conn, "SELECT `f_id` FROM `flight_users` WHERE `f_mailid` = '$f_mailid'");
        return mysqli_result($conn, $query, 0, 'f_id');
    } 

    function f_login($f_uname, $f_password) {
        $f_id = f_id_from_username($f_uname);
        $f_uname = sanitize($f_uname);
        $f_password = md5($f_password);
        $query = mysqli_query($conn, "SELECT COUNT(`f_id`) FROM `flight_users` WHERE `f_uname`= '$f_uname' AND `f_password` = '$f_password'");
        return (mysqli_result($conn, $query, 0) == 1) ? $f_id : false;
    }

?>

这是 Loginact.php------------------

<?php

        $title = 'Swift Airlines | Login Error';
    include $_SERVER["DOCUMENT_ROOT"].'/swift/core/init.php';


    if(empty($_POST) === false) {
        $f_uname = $_POST['f_uname'];
        $f_password = $_POST['f_password'];

        if(empty($f_uname) === true || empty($f_password) === true){
            $errors[] = 'You need to enter both, the username and the password!';
        } 
        else  if (f_exists($f_uname)===false) {
            $errors[] = 'No such user exists! Please register!';
        }
        else if(f_active($f_uname)===false) {
            $errors[] = 'Please activate your account!';
        }
        else {

            if(strlen($f_password)>32) {
                $errors[] = 'Password too long!';
            }

            $f_login = f_login($f_uname, $f_password);
            if($f_login===false) {
                $errors[] = 'Username and Password do not match!';
            }
            else {
                $_SESSION['f_id'] = $f_login;
                header('Location: http://localhost/swift/index.php');
                exit();
            }
        }       
    }
    else {
            $errors[] = 'No Log In credentials received!';
        }

    include $_SERVER["DOCUMENT_ROOT"].'/swift/includes/overall/header.php';

    if(empty($errors) === false) {
?>
    <br/><h4>We tried to log you in, but : </h4><br/>

<?php
    echo output_errors($errors);
    }

    include $_SERVER["DOCUMENT_ROOT"].'/swift/includes/overall/footer.php';

?>

我知道 php 有点难，是的，我已经寻找了将近一天的答案。我刚接触编程，我正在尽我所能努力学习这些东西，希望有人能帮助我。

我希望我可以在这里了解更多关于 php 和其他编程语言的信息.. 即使我现在问，我也会继续寻找答案.. 非常感谢。

【问题讨论】：

html 或 css 在哪里？
仅供参考，当您发布行号（来自错误）时，请在代码中识别这些行。
你可以为它使用类和对象
您的清理功能正在过滤和转义。它试图成为一种适合所有魔法消毒剂的尺寸。学会适当地逃跑。

标签： php html css mysql mysqli

【解决方案1】：

我怀疑你什么都试过了！

看起来你正在尝试从 mysql_ 函数迁移到 mysqli_。

来自manual for mysqli_fetch_array：

$query = "SELECT Name, CountryCode FROM City ORDER by ID LIMIT 3";
$result = mysqli_query($link, $query);

/* numeric array */
$row = mysqli_fetch_array($result, MYSQLI_NUM);
printf ("%s (%s)\n", $row[0], $row[1]);

$link 是你的 mysqli 连接。在你的代码中是 $conn。

在您的函数中，您遇到了范围问题。 $conn 在全局范围内，所以没有设置在函数的范围内。

分解它，从你的 f_id_from_email 函数开始，然后按照并尝试翻译手册中的示例。

如果阅读，错误消息实际上非常有用。但是您可能会不知所措，因为您面临着许多问题。

调用未定义函数 mysqli_result()

那是因为没有mysqli_result函数。

【讨论】：

【解决方案2】：

1-general.php 第 49 行：查看mysqli_real_escape_string，在程序代码中，您必须指定 2 个参数，即链接（或连接）和字符串。

function array_sanitize($conn,$item) {
        $item = htmlentities(strip_tags(mysqli_real_escape_string($conn,$item)));
    }

function sanitize($conn,$data) {
    return htmlentities(strip_tags(mysqli_real_escape_string($conn,$data)));
}

2-users.php，都在第85行，$conn不存在于函数范围内。将 $conn 作为参数传递给函数并使用 ($conn,$f_uname) 调用它。

function f_exists($conn,$f_uname) {
    $f_uname = sanitize($f_uname);
    $query = mysqli_query($conn, "SELECT COUNT(`f_id`) FROM `flight_users` WHERE `f_uname`= '$f_uname'");
    return (mysqli_result($conn, $query, 0) == 1) ? true : false; 
}

3- 你的问题在第 86 行，与我的第 2 点相同。

【讨论】：