卓越飞翔博客php小编子墨为大家带来了关于php会话编码解码的详细解析。在web开发中，会话编码解码是非常重要的一环，它涉及到了数据的安全传输和存储。通过深入了解php的会话编码解码机制，可以帮助开发者更好地保护用户数据，提高网站的安全性。本文将为大家介绍会话编码解码的原理、常用方法以及实际应用技巧，帮助读者更好地掌握php会话处理的技术要点。
在 php 中演示使用 session_encode() 和 session_decode
内置函数 session_encode() 将 $_SESSION 数组数据序列化为字符串，然后 session_decode() 再次将会话数据转换为真实格式。
我们通过表单插入数据，然后将其存储到会话中：
test.php：
<code class="language-php hljs" data-lang="php"><span style="display:flex;"><span><span style="color:#666"><strong class="keylink">html</strong><span style="color:#666">></span>
</span></span><span style="display:flex;"><span><span style="color:#666">head<span style="color:#666">></span>
</span></span><span style="display:flex;"><span><span style="color:#666">title<span style="color:#666">></span> Demonstration of Session <span style="color:#666"></span>title<span style="color:#666">></span>
</span></span><span style="display:flex;"><span><span style="color:#666"></span>head<span style="color:#666">></span>
</span></span><span style="display:flex;"><span><span style="color:#666">body<span style="color:#666">></span>
</span></span><span style="display:flex;"><span><span style="color:#666">f<strong class="keylink">ORM</strong> action<span style="color:#666">=</span><span style="color:#ba2121">"action.php"</span> method<span style="color:#666">=</span><span style="color:#ba2121">"post"</span> <span style="color:#666">></span>
</span></span><span style="display:flex;"><span><span style="color:#666">div style<span style="color:#666">=</span><span style="color:#ba2121">"border: 4px solid;padding:10px; width:40%"</span><span style="color:#666">></span>
</span></span><span style="display:flex;"><span>Employee Name<span style="color:#666">:input type<span style="color:#666">=</span><span style="color:#ba2121">"text"</span> name<span style="color:#666">=</span><span style="color:#ba2121">"employee"</span><span style="color:#666">></span>
</span></span><span style="display:flex;"><span>ID<span style="color:#666">:input type<span style="color:#666">=</span><span style="color:#ba2121">"text"</span>name<span style="color:#666">=</span><span style="color:#ba2121">"id"</span><span style="color:#666">></span>
</span></span><span style="display:flex;"><span><span style="color:#666">input type<span style="color:#666">=</span><span style="color:#ba2121">"submit"</span> value<span style="color:#666">=</span><span style="color:#ba2121">"SUBMIT"</span> name<span style="color:#666">=</span><span style="color:#ba2121">"submit"</span><span style="color:#666">></span>
</span></span><span style="display:flex;"><span><span style="color:#666"></span>div<span style="color:#666">></span>
</span></span><span style="display:flex;"><span><span style="color:#666"></span>form<span style="color:#666">></span>
</span></span><span style="display:flex;"><span><span style="color:#666"></span>body<span style="color:#666">></span>
</span></span><span style="display:flex;"><span><span style="color:#666"></span>html<span style="color:#666">></span>
</span></span></span></span></span></span></span></span></span></span></span>会话像 cookie 一样工作；一旦我们启动会话并开始存储数据，我们就可以使用它直到会话被销毁。
输出：
编码的会话字符串包含由 ; 分隔的所有会话元素。这里应该提到的是，这种序列化与 PHP serialize() 不同。
action.php：
<code class="language-php hljs" data-lang="php"><span style="display:flex;"><span><span style="color:#666"></span>php
</span></span><span style="display:flex;"><span><span style="color:#008000;font-weight:bold">if</span> (isset(<span style="color:#19177c">$_POST</span>[<span style="color:#ba2121">'submit'</span>]))
</span></span><span style="display:flex;"><span>{
</span></span><span style="display:flex;"><span><span style="color:#408080;font-style:italic">// Start the Session
</span></span></span><span style="display:flex;"><span>session_start();
</span></span><span style="display:flex;"><span><span style="color:#408080;font-style:italic">//Form Data
</span></span></span><span style="display:flex;"><span><span style="color:#19177c">$employee</span><span style="color:#666">=</span><span style="color:#19177c">$_POST</span>[<span style="color:#ba2121">'employee'</span>];
</span></span><span style="display:flex;"><span><span style="color:#19177c">$id</span><span style="color:#666">=</span><span style="color:#19177c">$_POST</span>[<span style="color:#ba2121">'id'</span>];
</span></span><span style="display:flex;"><span><span style="color:#408080;font-style:italic">//store the form data into session
</span></span></span><span style="display:flex;"><span><span style="color:#19177c">$_SESSION</span>[<span style="color:#ba2121">'employee'</span>]<span style="color:#666">=</span><span style="color:#19177c">$employee</span>;
</span></span><span style="display:flex;"><span><span style="color:#19177c">$_SESSION</span>[<span style="color:#ba2121">'id'</span>]<span style="color:#666">=</span><span style="color:#19177c">$id</span>;
</span></span><span style="display:flex;"><span>
</span></span><span style="display:flex;"><span><span style="color:#008000;font-weight:bold">echo</span> <span style="color:#ba2121">"According to the data from session: <br>"</span>;
</span></span><span style="display:flex;"><span><span style="color:#008000;font-weight:bold">echo</span> <span style="color:#ba2121">"Hello "</span><span style="color:#666">.</span> <span style="color:#19177c">$employee</span><span style="color:#666">.</span> <span style="color:#ba2121">"! your ID is "</span><span style="color:#666">.</span><span style="color:#19177c">$id</span><span style="color:#666">.</span><span style="color:#ba2121">"<br><br>"</span>;
</span></span><span style="display:flex;"><span>
</span></span><span style="display:flex;"><span><span style="color:#008000;font-weight:bold">echo</span><span style="color:#ba2121">"The encoded Session Data is: <br>"</span>;
</span></span><span style="display:flex;"><span> <span style="color:#408080;font-style:italic">//encode the session
</span></span></span><span style="display:flex;"><span><span style="color:#19177c">$session_econded</span><span style="color:#666">=</span> session_encode();
</span></span><span style="display:flex;"><span><span style="color:#008000;font-weight:bold">echo</span> <span style="color:#19177c">$session_econded</span><span style="color:#666">.</span><span style="color:#ba2121">"<br><br>"</span>;
</span></span><span style="display:flex;"><span> <span style="color:#408080;font-style:italic">//decode session
</span></span></span><span style="display:flex;"><span>session_decode(<span style="color:#19177c">$session_econded</span>);
</span></span><span style="display:flex;"><span><span style="color:#008000;font-weight:bold">echo</span> <span style="color:#ba2121">"Session data after decode: "</span>;
</span></span><span style="display:flex;"><span>print_r( <span style="color:#19177c">$_SESSION</span>);
</span></span><span style="display:flex;"><span> <span style="color:#408080;font-style:italic">//Destroy the Session
</span></span></span><span style="display:flex;"><span>session_destroy();
</span></span><span style="display:flex;"><span>}
</span></span><span style="display:flex;"><span><span style="color:#bc7a00">?></span><span >
</span></span></span>输出：
<code class="language-text hljs" data-lang="text"><span style="display:flex;"><span>According to the data from session:
</span></span><span style="display:flex;"><span>Hello Jack! your ID is 1234
</span></span><span style="display:flex;"><span>
</span></span><span style="display:flex;"><span>The encoded Session Data is:
</span></span><span style="display:flex;"><span>employee|s:4:"Jack";id|s:4:"1234";
</span></span><span style="display:flex;"><span>
</span></span><span style="display:flex;"><span>Session data after decode: Array ( [employee] => Jack [id] => 1234 )
</span></span>
编码数据采用类似于 PHP serialize() 的字符串形式。
