blocks|key|3007951|text|只清除$_SESSION变量。它等同于做：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3007952|$_SESSION+=+array();|code-block|syntax|javascript|3007953|因此，这只影响本地$_SESSION变量实例，而不影响会话存储中的会话数据。|3007954|相反，会销毁存储在会话存储中的会话数据(例如，文件系统中的会话文件)。|3007955|其他一切都保持不变。|3007956|entityMap^0|3|9|0|0|9|9|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|M|3|N|5|6|7|Z|8|@]|D|@]|E|$]]|$1|O|3|P|5|6|7|10|8|@]|D|@]|E|$]]|$1|Q|3|-4|5|6|7|11|8|@]|D|@]|E|$]]]|R|$]]

<a href="http://php.net/session_unset" rel="noreferrer"><code>session_unset</code></a> just clears the <code>$_SESSION</code> variable. It’s equivalent to doing:

<pre><code>$_SESSION = array();
</code></pre>

So this does only affect the local <code>$_SESSION</code> variable instance but not the session data in the session storage.

In contrast to that, <a href="http://php.net/session_destroy" rel="noreferrer"><code>session_destroy</code></a> destroys the session data that is stored in the session storage (e.g. the session file in the file system).

Everything else remains unchanged.

blocks|key|289552|text|session_destroy();正在删除整个会话。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|289553|session_unset();仅从会话中删除变量-会话仍然存在。仅截断数据。|289554|entityMap^0|0|I|0|0|G|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|P|8|@]|D|@]|E|$]]]|I|$]]

<code>session_destroy();</code> is deleting the whole session.

<code>session_unset();</code> deletes only the variables from session - session still exists. Only data is truncated.

blocks|key|3008000|text|session_unset();|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|3008001|unstyled|3008002|只清除所有会话变量的所有数据。|blockquote|3008003|3008004|3008005|session_destroy();|3008006|3008007|删除所有会话。|3008008|3008009|3008010|​|3008011|3008012|示例|offset|length|style|BOLD|3008013|3008014|session_start();
session_destroy();+++++
$a+=+"1234";
$_SESSION[a]+=+$a;|3008015|3008016|+$_SESSION[a]+is+NULL。|CODE|3008017|3008018|3008019|session_start();
session_unset();+++++
$a+=+"1234";
$_SESSION[a]+=+$a;|3008020|3008021|+$_SESSION[a]+is+1234。|3008022|3008023|3008024|因此，我将使用：|3008025|session_start();
session_destroy();+++
session_start();++
$a+=+"1234";
$_SESSION[a]+=+$a;|3008026|entityMap^0|0|0|0|0|0|0|0|0|0|0|0|0|0|2|0|0|0|0|1|C|H|4|0|0|0|0|0|1|C|H|4|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1M|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|1N|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|1O|8|@]|9|@]|A|$]]|$1|I|3|-4|5|E|7|1P|8|@]|9|@]|A|$]]|$1|J|3|-4|5|E|7|1Q|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|1R|8|@]|9|@]|A|$B|C]]|$1|M|3|-4|5|E|7|1S|8|@]|9|@]|A|$]]|$1|N|3|O|5|H|7|1T|8|@]|9|@]|A|$]]|$1|P|3|-4|5|E|7|1U|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|E|7|1V|8|@]|9|@]|A|$]]|$1|R|3|S|5|E|7|1W|8|@]|9|@]|A|$]]|$1|T|3|-4|5|E|7|1X|8|@]|9|@]|A|$]]|$1|U|3|V|5|E|7|1Y|8|@$W|1Z|X|20|Y|Z]]|9|@]|A|$]]|$1|10|3|S|5|E|7|21|8|@]|9|@]|A|$]]|$1|11|3|12|5|6|7|22|8|@]|9|@]|A|$B|C]]|$1|13|3|-4|5|E|7|23|8|@]|9|@]|A|$]]|$1|14|3|15|5|H|7|24|8|@$W|25|X|26|Y|16]|$W|27|X|28|Y|16]]|9|@]|A|$]]|$1|17|3|-4|5|E|7|29|8|@]|9|@]|A|$]]|$1|18|3|-4|5|E|7|2A|8|@]|9|@]|A|$]]|$1|19|3|1A|5|6|7|2B|8|@]|9|@]|A|$B|C]]|$1|1B|3|-4|5|E|7|2C|8|@]|9|@]|A|$]]|$1|1C|3|1D|5|H|7|2D|8|@$W|2E|X|2F|Y|16]|$W|2G|X|2H|Y|16]]|9|@]|A|$]]|$1|1E|3|-4|5|E|7|2I|8|@]|9|@]|A|$]]|$1|1F|3|-4|5|E|7|2J|8|@]|9|@]|A|$]]|$1|1G|3|1H|5|E|7|2K|8|@]|9|@]|A|$]]|$1|1I|3|1J|5|6|7|2L|8|@]|9|@]|A|$B|C]]|$1|1K|3|-4|5|E|7|2M|8|@]|9|@]|A|$]]]|1L|$]]

<pre><code>session_unset();
</code></pre>

<blockquote>
 Just clear all data of all session variable.
</blockquote>

 

<pre><code>session_destroy();
</code></pre>

<blockquote>
 Remove all session.
</blockquote>

<hr/>
Example:

<pre><code>session_start();
session_destroy(); 
$a = "1234";
$_SESSION[a] = $a;
</code></pre>

<blockquote>
 <code>$_SESSION[a]</code> is <code>NULL</code>.
</blockquote>

 

<pre><code>session_start();
session_unset(); 
$a = "1234";
$_SESSION[a] = $a;
</code></pre>

<blockquote>
 <code>$_SESSION[a]</code> is <code>1234</code>.
</blockquote>

 

So, I will use:

<pre><code>session_start();
session_destroy(); 
session_start(); 
$a = "1234";
$_SESSION[a] = $a;
</code></pre>

blocks|key|292844|text|session_unset()将清除$_SESSION变量(就像在array()中一样)，但它不会接触会话文件。但是当脚本结束时，$_SESSION的状态将写入到文件中。然后它将清除该文件，但不会将其删除。当您使用session_destroy()时，它不会触及$_SESSION+(在session_destroy()之后使用var_dump($_SESSION)+)，但会删除会话文件，因此当脚本退出时，将不会有一个文件来写入$_SESSION的状态。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|292845|entityMap^0|0|F|I|9|X|7|1T|9|2Z|H|3N|9|3Z|H|4K|J|5Z|9|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]|$9|O|A|P|B|C]|$9|Q|A|R|B|C]|$9|S|A|T|B|C]|$9|U|A|V|B|C]|$9|W|A|X|B|C]|$9|Y|A|Z|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|10|8|@]|D|@]|E|$]]]|G|$]]

<code>session_unset()</code> will clear the <code>$_SESSION</code> variable (as in <code>array()</code>), but it won't touch the session file. But when the script ends; the state of the <code>$_SESSION</code> will be written to the file. Then it will clear the file but won't delete it. When you use <code>session_destroy()</code> it won't touch <code>$_SESSION</code> (Use <code>var_dump($_SESSION)</code> after <code>session_destroy()</code>), but will delete the session file, so when script exits there won't be a file to write the state of the <code>$_SESSION</code>.

blocks|key|3008094|text|我尝试使用session_unset($_SESSION['session_name'])，认为它只会取消设置特定的或单个/单个会话名称。但是使用session_unset($_SESSION['session_name'])只会取消设置所有会话名称。如果您想要取消设置单个会话名称，则正确的代码只有unset($_SESSION['session_name'])。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3008095|entityMap^0|5|14|21|14|46|W|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|O|8|@]|D|@]|E|$]]]|G|$]]

I tried to use <code>session_unset($_SESSION['session_name'])</code> thinking it will only unset specific or individual/single session name. But using <code>session_unset($_SESSION['session_name'])</code> will only unset all session name. The right code to use is only <code>unset($_SESSION['session_name'])</code> if you want to unset a single session name.

blocks|key|3222209|text|session_destroy()将在移动页面后删除会话，而session_unset()将在代码运行时删除会话。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3222210|entityMap^0|0|H|U|F|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

<code>session_destroy()</code> will delete the session after moving the page
and
<code>session_unset()</code> will delete session when the code is run.

blocks|key|3222291|text|session_start()；#它将在浏览器实时内存中创建一个虚拟数组(关联)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3222292|添加了两个项目|3222293|>+$_SESSION['me']+=+"Yadab";++
>+$_SESSION['you']+=+"Avi";
>
>+print_r($_SESSION);+#will+give,+array(+"me"=>"Yadab",+"you"=>"Avi"+)|code-block|syntax|javascript|3222294|test1|3222295|>+unset($_SESSION['me']);+#only+'me'+variable+is+removed+fully+(index+&+value)+
>+print_r($_SESSION);+#now+the+array+is+Array("you"=>"Avi")|3222296|test2|3222297|>+session_destroy();+#will+unset+the+values+of+all+session+variables,+but+indexes+exists+
>+print_r($_SESSION);+#Output,+Array("you"=>undefined)
>+#but+some+browser+can+store+the+value+in+cookies|3222298|test3|3222299|>+session_unset();+#will+unset+all+the+main+variables+not+only+the+values+
>+print_r($_SESSION);+#that+means+session+array+is+now+empty,+like+Array()|3222300|通过注释掉其他模块，分别测试模块1、2或3|3222301|entityMap^0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Z|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|10|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|11|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|12|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|13|8|@]|9|@]|A|$]]|$1|O|3|P|5|F|7|14|8|@]|9|@]|A|$G|H]]|$1|Q|3|R|5|6|7|15|8|@]|9|@]|A|$]]|$1|S|3|T|5|F|7|16|8|@]|9|@]|A|$G|H]]|$1|U|3|V|5|6|7|17|8|@]|9|@]|A|$]]|$1|W|3|-4|5|6|7|18|8|@]|9|@]|A|$]]]|X|$]]

session_start(); #it will create an virtual array (associative) in browser realtime memory

<h1>two item added</h1>

<pre><code>&gt; $_SESSION['me'] = "Yadab"; 
&gt; $_SESSION['you'] = "Avi";
&gt;
&gt; print_r($_SESSION); #will give, array( "me"=&gt;"Yadab", "you"=&gt;"Avi" )
</code></pre>

<h1>test1</h1>

<pre><code>&gt; unset($_SESSION['me']); #only 'me' variable is removed fully (index &amp; value) 
&gt; print_r($_SESSION); #now the array is Array("you"=&gt;"Avi")
</code></pre>

<h1>test2</h1>

<pre><code>&gt; session_destroy(); #will unset the values of all session variables, but indexes exists 
&gt; print_r($_SESSION); #Output, Array("you"=&gt;undefined)
&gt; #but some browser can store the value in cookies
</code></pre>

<h1>test3</h1>

<pre><code>&gt; session_unset(); #will unset all the main variables not only the values 
&gt; print_r($_SESSION); #that means session array is now empty, like Array()
</code></pre>

<h1>test block 1, 2, or 3 at individually by comment out others</h1>

blocks|key|289649|text|我认为session_destroy()和session_unset()应该同时使用，以确保会话数据一定会被删除。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|289650|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I think session_destroy() and session_unset() should be used at the same time to make sure that session data is surely deleted.

From the <a href="http://php.net" rel="noreferrer">php.net</a> documentation:

<blockquote>
 <a href="http://php.net/manual/en/function.session-destroy.php" rel="noreferrer">session_destroy</a> — Destroys all data registered to a session
 
 <a href="http://php.net/manual/en/function.session-unset.php" rel="noreferrer">session_unset</a> — Free all session variables
</blockquote>

My three part question is:

The two functions seem very similar. 
What is really the difference between the two?

Both seem to delete all variables registered to a session. Does any of them actually destroy the session itself? If not, how do you accomplish this (destroy the session itself).

Is it correct that neither of the two functions deletes the session cookie at the client?

What is the difference between session_unset() and session_destroy() in PHP?

文件系统

从文档中：  -销毁注册到会话的所有数据 -释放所有会话变量我的三部分问题是：这两个功能看起来非常相似。这两者到底有什么不同呢？两者似乎都删除了注册到会话的所有变量。它们中的任何一个实际上会破坏会话本身吗？如果不是，您如何完成此操作(销毁会话本身)。这两个函数都不会删除客户端的会话cookie，这是正确的吗？

问PHP中的session_unset()和session_destroy()有什么不同？
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问PHP中的session_unset()和session_destroy()有什么不同？
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