PHP會話未保存

Question

我的會議沒有進行。 每次我重新加載頁面時，它都會生成一個新的會話ID並刪除所有會話變量。.我不確定我的代碼或配置中是否有錯誤。 我在Mac上使用MAMP作為帶有php 5.2.17的本地服務器軟件

每個php文件首先都包含layout_top.php。 layout_top每次都會啟動會話：

<?php

        session_start();

    ?>

還有一個這樣的登錄站點：

<?php

include 'layout_top.php';

include 'db_connect.php';

$username = $_POST["li_username"]; 
$pw = $_POST["li_passwort"];

    if ($username == "" || $pw == "") {
        echo "Fülle bitte alle Felder aus!";
        }

    else {

        $check_pw_query = mysql_query("SELECT password FROM user WHERE username = '$username'") or die(mysql_error());

        $check_pw = mysql_fetch_assoc($check_pw_query);

        if ($pw == $check_pw{'password'}) {
            echo "Juhu! </br>";



            $first_name_query = mysql_query("SELECT first_name FROM user WHERE username = '$username'") or die(mysql_error());

            $first_name = mysql_fetch_assoc($first_name_query);

            $second_name_query = mysql_query("SELECT second_name FROM user WHERE username = '$username'") or die(mysql_error());

            $second_name = mysql_fetch_assoc($second_name_query);        

            $id_query = mysql_query("SELECT id FROM user WHERE username = '$username'") or die(mysql_error());

            $id = mysql_fetch_assoc($id_query);

            if (!isset($_SESSION['username'])) {
                $_SESSION['username'] = $username;
            }

            if (!isset($_SESSION['first_name'])) {
                $_SESSION['first_name'] = $first_name{'first_name'};
            }    

            if (!isset($_SESSION['second_name'])) {
                $_SESSION['second_name'] = $second_name{'second_name'};
            }

            if (!isset($_SESSION['id'])) {
                $_SESSION['id'] = $id{'id'};
            }
            if (!isset($_SESSION['gender'])) {
                $_SESSION['gender'] = $gender{'gender'};
            }

        }

    }

在那里設置了會話變量..但是如果我重新加載頁面，所有會話變量都消失了。 希望你理解我的問題。 感謝您的幫助。

編輯：這是phpinfo（），也許這將有助於發現問題。

session.auto_start          Off Off
session.bug_compat_42   On  On
session.bug_compat_warn On  On
session.cache_expire    180 180
session.cache_limiter   nocache nocache
session.cookie_domain   no value    no value
session.cookie_httponly Off Off
session.cookie_lifetime 0   0
session.cookie_path /   /
session.cookie_secure   Off Off
session.entropy_file    no value    no value
session.entropy_length  0   0
session.gc_divisor  100 100
session.gc_maxlifetime  1440    1440
session.gc_probability  1   1
session.hash_bits_per_character|4   4
session.hash_function   0   0
session.name            PHPSESSID|PHPSESSID
session.referer_check   no value    no value
session.save_handler    files   files
session.save_path   /Applications/MAMP/tmp/php  /Applications/MAMP/tmp/php
session.serialize_handler   php php
session.use_cookies On  On
session.use_only_cookies    Off Off
session.use_trans_sid   0   0

編輯2：

Strict Standards: session_start() [function.session-start]: It is not safe to rely on the system's timezone settings. Please use the date.timezone setting, the TZ environment variable or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Europe/Berlin' for 'CET/1.0/no DST' instead in /Applications/MAMP/htdocs/network/layout_top.php on line 6

Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /Applications/MAMP/htdocs/network/layout_top.php:1) in /Applications/MAMP/htdocs/network/layout_top.php on line 6

Strict Standards: session_start() [function.session-start]: It is not safe to rely on the system's timezone settings. Please use the date.timezone setting, the TZ environment variable or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Europe/Berlin' for 'CET/1.0/no DST' instead in /Applications/MAMP/htdocs/network/layout_top.php on line 6

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /Applications/MAMP/htdocs/network/layout_top.php:1) in /Applications/MAMP/htdocs/network/layout_top.php on line 6

Answer 1

為什么您要查詢這么多...試試這個

       $query = mysql_query("SELECT * FROM user WHERE username = '$username'") or die(mysql_error());

        while($row = mysql_fetch_array($first_name_query))
        {

        if (!isset($_SESSION['username'])) {
            $_SESSION['username'] = $row['username'];
        }

        if (!isset($_SESSION['first_name'])) {
            $_SESSION['first_name'] = $row['first_name'];
        }    

        if (!isset($_SESSION['second_name'])) {
            $_SESSION['second_name'] = $row['second_name'];
        }

        if (!isset($_SESSION['id'])) {
            $_SESSION['id'] = $row['id'];
        }
        if (!isset($_SESSION['gender'])) {
            $_SESSION['gender'] = $row['gender'];
        }
        }

而且我不建議您在會話上保存多個數據 ..只需將userid保存在會話變量中，因為會話變量保存在服務器上，因此會給服務器帶來負擔。

如果您的會話目錄（最像您所說的/ tmp）是不可寫的，那么它將無法保存，並且每次都必須重新生成一個新目錄。 這是驗證方法：

if ( !is_writable(session_save_path()) ) { echo 'Session save path "'.session_save_path().'" is not writable!'; }

如果不是可寫的 ，則請更改目錄權限 ...

對於時區錯誤..請查看此鏈接..您需要set default timezone http://pl.php.net/manual/en/function.date-default-timezone-set.php

對於已發送的標頭錯誤，請檢查如何修復PHP中的“已發送 標頭 ”錯誤

所以你會完成的.. :)

如果您需要任何進一步的指導，請告訴我。

Answer 2

您確定實際上包含“ layout_top.php”嗎？ 可能是路徑問題，如果使用include而不是require並禁用了error_reporting則可能會出現此問題，因為include的失敗將導致警告而不是錯誤，並且不會顯示警告消息。

請在session_start 之后添加一行代碼到您的layout_top.php中，例如echo "hello! session started!"; 查看會話是否已開始或僅使用require而不是include因此在找不到文件的情況下，您的腳本將因致命錯誤而死亡。

Answer 3

這是一個模糊的答案，但有時可能會有所幫助。

不要通過包含layout_top.php在每個文件上使用sesison_start() 。 嘗試在第一次加載時啟動會話，然后避免再次調用session_start() 。