每个会话调用是对服务器的单独调用 [英] is each session call is separate call to server
问题描述
记住服务器负载，我想知道对会话的每次调用是否是对服务器的单独调用，这会增加服务器负载吗?让我稍微解释一下.假设在每个php页面中，我必须设置10个会话数据并且必须像这样调用10个会话数据:
Keeping in mind of server load, I want to know whether each call to session is a separate call to server which increases server load? Let me explain it little bit. Suppose in each php page, I have to set 10 session data and have to call 10 session data also like this:
$_SESSION['a']=1;
$_SESSION['b']=2;
$_SESSION['c']=3;
$_SESSION['d']=4;
$_SESSION['e']=5;
$_SESSION['f']=6;
$_SESSION['g']=7;
$_SESSION['h']=8;
$_SESSION['i']=9;
$_SESSION['j']=10;
echo $_SESSION['a'];
echo $_SESSION['b'];
echo $_SESSION['c'];
echo $_SESSION['d'];
echo $_SESSION['e'];
echo $_SESSION['f'];
echo $_SESSION['g'];
echo $_SESSION['h'];
echo $_SESSION['i'];
echo $_SESSION['j'];
设置以上10个会话并输出相同，这些是20个单独调用服务器还是通过session_start()，在页面加载时一次性加载整个会话数据?
setting of above 10 sessions and outputting the same, will these be 20 separate calls to server or by session_start(), whole session data is loaded at once during page loading?
还想知道如何在会话中存储多维关联数组?假设我想像这样设置上面的10个会话数据:
Also want to know how to store multidimensional associative array in session? Suppose I want to set the above 10 session data like this:
$_SESSION['mydata']=array(
a=>1,
b=>2,
c=>3,
d=>4,
e=>5,
f=>6,
g=>7,
h=>8,
i=>9,
j=>10
)
echo $_SESSION['mydata']['a'];
通过上面的例子，如果每个会话调用都是对服务器的单独调用，我可以减少服务器负载.
By the above example I can reduce server loads if each session call is separate call to server.
有人告诉我设置和获取会话数据时发生了什么吗?
Anyone clear me what's going on when we set and get session data?
推荐答案
这是一个会话的细分
session_start();要么在硬盘驱动器上创建一个会话文件，要么访问一个已经存在的会话文件.它是一个序列化的数组- 这个数组被加载到内存中并在内存中被操作，直到脚本完成执行或者你可以强制它使用
session_write_close()重写文件
session_start();either creates a session file on the hard drive or accesses one if it is already there. It is a serialized array- This array gets loaded into memory and is manipulated within memory until the script finishes executing or you can force it to re-write the file with
session_write_close()
您可以在开始会话后添加/删除任意数量的数据，因为这与操作数组没有什么不同.
You can add/remove as much data as you wish after you have started the session because it is no different than manipulating an array.
繁重的工作在 session_start 和 session_write_close 完成，因为那是 PHP 真正需要访问硬盘的时间
The heavy lifting is done at session_start and session_write_close because that is when PHP actually has to access the hard drive
理论上每个用户可以在 FAT32 服务器上拥有一个 4GB 的会话文件，或者在 NTFS 服务器上拥有更大的会话文件，但我相信您可以想象会出现可怕的性能问题.
In theory each user can have a 4GB session file on a FAT32 server, or larger on NTFS server, but I am sure you can imagine the horrendous performance issues that would arise.
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