我在多个屏幕中构建了一个面向公众的PHP应用程序。它在我的个人台式电脑上测试得很好，但在正在测试应用程序的其他PC上无效。所有PC都使用Windows 10，浏览器是Firefox。 Unix服务器上“tmp”文件夹的权限是“755”。 服务器上PHP.ini文件的SESSIONS部分如下：
[Session]
; Handler used to store/retrieve data.
session.save_handler = files
; Argument passed to save_handler. In the case of files, this is the path
; where data files are stored. Note: Windows users have to change this
; variable in order to use PHP's session functions.
; As of PHP 4.0.1, you can define the path as:
; session.save_path = "N;/path"
; where N is an integer. Instead of storing all the session files in
; /path, what this will do is use subdirectories N-levels deep, and
; store the session data in those directories. This is useful if you
; or your OS have problems with lots of files in one directory, and is
; a more efficient layout for servers that handle lots of sessions.
; NOTE 1: PHP will not create this directory structure automatically.
; You can use the script in the ext/session dir for that purpose.
; NOTE 2: See the section on garbage collection below if you choose to
; use subdirectories for session storage
session.save_path = /tmp
; Whether to use cookies.
session.use_cookies = 1
; This option enables administrators to make their users invulnerable to
; attacks which involve passing session ids in URLs; defaults to 0.
; session.use_only_cookies = 1
; Name of the session (used as cookie name).
session.name = PHPSESSID
; Initialize session on request startup.
session.auto_start = 0
; Lifetime in seconds of cookie or, if 0, until browser is restarted.
session.cookie_lifetime = 0
; The path for which the cookie is valid.
session.cookie_path = /
; The domain for which the cookie is valid.
session.cookie_domain =
; Handler used to serialize data. php is the standard serializer of PHP.
session.serialize_handler = php
; Define the probability that the 'garbage collection' process is started
; on every session initialization.
; The probability is calculated by using gc_probability/gc_divisor,
; e.g. 1/100 means there is a 1% chance that the GC process starts
; on each request.
session.gc_probability = 1
session.gc_divisor = 100
; After this number of seconds, stored data will be seen as 'garbage' and
; cleaned up by the garbage collection process.
session.gc_maxlifetime = 1440
; NOTE: If you are using the subdirectory option for storing session files
; (see session.save_path above), then garbage collection does *not*
; happen automatically. You will need to do your own garbage
; collection through a shell script, cron entry, or some other method.
; For example, the following script would is the equivalent of
; setting session.gc_maxlifetime to 1440 (1440 seconds = 24 minutes):
; cd /path/to/sessions; find -cmin +24 | xargs rm
; PHP 4.2 and less have an undocumented feature/bug that allows you to
; to initialize a session variable in the global scope, albeit register_globals
; is disabled. PHP 4.3 and later will warn you, if this feature is used.
; You can disable the feature and the warning separately. At this time,
; the warning is only displayed, if bug_compat_42 is enabled.
session.bug_compat_42 = 1
session.bug_compat_warn = 1
; Check HTTP Referer to invalidate externally stored URLs containing ids.
; HTTP_REFERER has to contain this substring for the session to be
; considered as valid.
session.referer_check =
; How many bytes to read from the file.
session.entropy_length = 0
; Specified here to create the session id.
session.entropy_file =
;session.entropy_length = 16
;session.entropy_file = /dev/urandom
; Set to {nocache,private,public,} to determine HTTP caching aspects
; or leave this empty to avoid sending anti-caching headers.
session.cache_limiter = nocache
; Document expires after n minutes.
session.cache_expire = 180
; trans sid support is disabled by default.
; Use of trans sid may risk your users security.
; Use this option with caution.
; - User may send URL contains active session ID
; to other person via. email/irc/etc.
; - URL that contains active session ID may be stored
; in publically accessible computer.
; - User may access your site with the same session ID
; always using URL stored in browser's history or bookmarks.
session.use_trans_sid = 0
; The URL rewriter will look for URLs in a defined set of HTML tags.
; form/fieldset are special; if you include them here, the rewriter will
; add a hidden <input> field with the info which is otherwise appended
; to URLs. If you want XHTML conformity, remove the form entry.
; Note that all valid entries require a "=", even if no value follows.
url_rewriter.tags = "a=href,area=href,frame=src,input=src,form=,fieldset="
所有PHP文件都以session_start（）开头; 这是传递变量的PHP文件片段（POST1.PHP）
<?php
session_start();
//Multiple processing statements not copied
//Obtain the primary key from the prior insert
$family_fkey = mysqli_insert_id($link);
//store the value of $family_fkey into the session variable 'family_fkey'
$_SESSION["family_fkey"] = $family_fkey;
//store the value of $family_last_name into the session variable 'family_last_name'
$_SESSION["family_last_name"] = $family_last_name;
//Close the connection
mysqli_close($link);
//Redirect to the submitted.php page
header("Location: http://example.org/my_app/input2.php");
//close PHP
?>
这是接收变量（INPUT2.PHP）的PHP文件的片段
<?php session_start();?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<!-- Multiple HTML and PHP Processing statements NOT copied here -->
<?php
ECHO "Session ID is: " . session_id() . "<br />";
// retrieve the session value 'family_fkey' and store it in $family_fkey
$family_fkey = $_SESSION['family_fkey'];
// retrieve the session value 'family_last_name' and store it in $family_last_name
$family_last_name = $_SESSION['family_last_name'];
ECHO "The family_last_name and family_fkey are: " .
$family_last_name . $family_fkey . "<br />";
当在我的家用电脑上执行Input2.php时，所有值都回显得很好。 当在许多其他PC上执行Input2.php时，我得到会话ID的值，但是两个值'family_fkey'和'family_last_name'值是空白的。这将是一个面向公众的应用程序。 为什么某些PC的变量通过OK而其他PC没有？ 谢谢你看这个。