Question

<?php 
include("global-settings.php"); 
session_start(); 
mysql_connect($dbhost, $dbuser, $dbpass)or die("Could Not Connect: " . mysql_error()); 
mysql_select_db($dbname) or die(mysql_error()); 
$email       = mysql_real_escape_string(strip_tags($_POST['email'])); 
$password  = mysql_real_escape_string(strip_tags(sha1($_POST['password']))); 

$result  = mysql_query("SELECT * FROM users WHERE username='$email' AND password='$password'") or die(mysql_error()); 

    while($row = mysql_fetch_array($result)) {
    if(mysql_num_rows($result) > 0) { 
        $_SESSION['user_pid']    = $row['user_pid']; 
        $_SESSION['firstname']     = $row['first_name']; 
        $_SESSION['lastname']     = $row['last_name']; 
        header("Location: ../protected/home.php"); 
    } else {
        $userid_generator = uniqid(rand(), false); 
        $date = date("Y/m/d"); 
        mysql_query("INSERT INTO users (user_pid, username, password, datetime_registered) 
        VALUES('$userid_generator', '$email', '$password', '$date')")or die(mysql_error()); 
        $_SESSION['userid']    = $userid_generator; 
        $_SESSION['firstname']     = $row['first_name']; 
        $_SESSION['lastname']     = $row['last_name']; 

        $leaders_query = "SELECT * FROM leaders"; 
        $leaders   = mysql_query($leaders_query); 

            $id = $row['id']; 
            mysql_query("INSERT IGNORE INTO friends (node1id, node2id, is_leader, friends_since, friend_type) 
            VALUES('$id', '$userid_generator', 'Yes', '$date', 'full)")or die(mysql_error());     
    }
        }
?>

由于某种原因，while循环似乎不起作用。当我在while循环中插入内容时，它会留下一个空白屏幕。有什么帮助吗？

Answer 1

你的逻辑有点不稳定。在这种情况下不需要while循环（使用一个只能产生最多单行数据的东西是货物崇拜编程的证据）。逻辑流程应该是：

$sql = "...";
$result = mysql_query($sql) or die(mysql_error());
if (mysql_num_rows($result) > 0) {
    $row = mysql_fetch_array($result);
    $_SESSION stuff
} else {
   ... create user record ...
}

同样，SELECT * FROM Leaders查询有什么意义？你实际上并没有从那个查询中获取任何东西，所以基本上它是一个无用的操作。

Answer 2

代码的逻辑错误：你的if（mysql_num_rows（...））应该在while（mysql_fetch_array（...））循环之前。尝试这样的事情：

<?php 
    include("global-settings.php"); 
    session_start(); 
    mysql_connect($dbhost, $dbuser, $dbpass)or die("Could Not Connect: " . mysql_error()); 
    mysql_select_db($dbname) or die(mysql_error()); 
    $email       = mysql_real_escape_string(strip_tags($_POST['email'])); 
    $password  = mysql_real_escape_string(strip_tags(sha1($_POST['password']))); 

    $result  = mysql_query("SELECT * FROM users WHERE username='$email' AND password='$password'") or die(mysql_error()); 

    if(mysql_num_rows($result) > 0) { 
        $row = mysql_fetch_array($result);
        $_SESSION['user_pid']    = $row['user_pid']; 
        $_SESSION['firstname']     = $row['first_name']; 
        $_SESSION['lastname']     = $row['last_name']; 
        header("Location: ../protected/home.php"); 
    } else {
        $userid_generator = uniqid(rand(), false); 
        $date = date("Y/m/d"); 
        $res_insert = mysql_query("INSERT INTO users (user_pid, username, password, datetime_registered) 
        VALUES('$userid_generator', '$email', '$password', '$date'); SELECT MAX(user_pid) FROM users;") or die(mysql_error()); 
        $_SESSION['userid']     = $userid_generator; 
        $_SESSION['firstname']  = $row['first_name']; 
        $_SESSION['lastname']   = $row['last_name']; 

        $leaders_query = "SELECT * FROM leaders"; 
        $leaders   = mysql_query($leaders_query); 

        $id = mysql_insert_id($res_insert);
        mysql_query("INSERT IGNORE INTO friends (node1id, node2id, is_leader, friends_since, friend_type) 
        VALUES('$id', '$userid_generator', 'Yes', '$date', 'full)") or die(mysql_error());     
    }
?>

Answer 3

可能结果集为空，你可以在执行do while时更改de，因此它将至少执行一次。

它是这样的，你试图计算一下，如果没有行，如果没有，它将永远不会通过那里。

Answer 4

<?php
session_start();
include("global-settings.php");
mysql_connect($dbhost, $dbuser, $dbpass)or die("Could Not Connect: " . mysql_error());
mysql_select_db($dbname) or die(mysql_error());

$email = mysql_real_escape_string(strip_tags($_POST["email"]));
$password = sha1($_POST["password"]);
$sql = "SELECT * FROM users WHERE email = '{$email}' AND password = '{$password}'";
$result = mysql_query($sql) or exit("ERROR: " . mysql_error() . "<br>IN QUERY: " . $sql);

if (mysql_num_rows($result) > 0) {
    $row = mysql_fetch_array($result);
    $_SESSION["userid"] = $row['user_pid'];
    echo "logged in";
} else {
    $userid_generator = uniqid(rand(), false);
    mysql_query("INSERT INTO users (user_pid, email, password, datetime_registered, is_leader) VALUES ('$userid_generator', '{$email}', '{$password}', NOW(), 'no')");
    $id = mysql_insert_id();
        $leaders = mysql_query("SELECT * FROM users WHERE is_leader LIKE '%yes%'");
        while($rows = mysql_fetch_array($leaders)) {
            if ($rows['is_leader'] == 'yes') {
                $leader_id = $rows['user_pid'];
                mysql_query("INSERT IGNORE INTO friends (node1id, node2id, friends_since, friend_type)
                VALUES('$leader_id', '$userid_generator', NOW(), 'full')");
                $_SESSION["userid"] = $userid_generator;
                echo "new user created and logged in";
                }

    if(is_dir($userid_generator)) {
    echo "Something wen't wrong. A bug report has been sent and we are doing what we can to fix it.";
    $message = 'Registration problem on account number $userid_generator. The user succesfully registered, but there is already
    a directory with the account id of $userid_generator.';
    mail($bug_report_email, "Registration Bug!", $message);
    } else {
    mkdir('../media/User-PID{' . $userid_generator . '}', 0777);
    mkdir('../media/User-PID{' . $userid_generator . '}/photos', 0777);
    mkdir('../media/User-PID{' . $userid_generator . '}/backups', 0777);
    mkdir('../media/User-PID{' . $userid_generator . '}/videos', 0777);
    mkdir('../media/User-PID{' . $userid_generator . '}/documents', 0777);
    mkdir('../media/User-PID{' . $userid_generator . '}/developer', 0777);
    mkdir('../media/User-PID{' . $userid_generator . '}/developer/apps', 0777);
    mkdir('../media/User-PID{' . $userid_generator . '}/developer/themes', 0777);
    mkdir('../media/User-PID{' . $userid_generator . '}/xml', 0777);
}
}
}
?>

我实际修好了它。谢谢大家的帮助！

如果内容在while循环中，则不处理页面

4 个答案: