PHP 會話編碼解碼

php小編子墨為大家帶來了關於PHP會話編碼解碼的詳細解析。在網路開發中，會話編碼解碼是非常重要的一環，它涉及了資料的安全傳輸和儲存。透過深入了解PHP的會話編碼解碼機制，可以幫助開發者更好地保護使用者數據，並提高網站的安全性。本文將為大家介紹會話編碼解碼的原理、常用方法以及實際應用技巧，幫助讀者更掌握PHP會話處理的技術要點。

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在 php 示範使用 sess<strong class="keylink">io</strong>n_encode() 和 session_decode

內建函數session_encode() 將$_SESSION 陣列資料序列化為字串，然後session_decode()再次將會話資料轉換為真實格式。

我們透過表單插入數據，然後將其儲存到會話中：

test.php：

<code>
<code class="language-php hljs" data-lang="php"><span style="display:flex;"><span><span style="color:#666"><</span><strong class="keylink">html</strong><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"><</span>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"><</span>body<span style="color:#666">></span>
</span></span><span style="display:flex;"><span><span style="color:#666"><</span>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"><</span>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">:<</span>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">:<</span>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"><</span>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></code></code>

會話像 cookie 一樣工作；一旦我們啟動會話並開始儲存數據，我們就可以使用它直到會話被銷毀。

輸出：

編碼的會話字串包含由 ; 分隔的所有會話元素。這裡應該要提到的是，這個序列化與 PHP serialize() 不同。

action.php：

<code>
<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">$_POST</span>[<span style="color:#ba2121">&#39;submit&#39;</span>]))
</span></span><span style="display:flex;"><span>{
</span></span><span style="display:flex;"><span><span style="color:#408080;font-style:italic">// Start the Session
</span></span></span><span style="display:flex;"><span>session_start();
</span></span><span style="display:flex;"><span><span style="color:#408080;font-style:italic">//Form Data
</span></span></span><span style="display:flex;"><span><span style="color:#19177c">$employee</span><span style="color:#666">=</span><span style="color:#19177c">$_POST</span>[<span style="color:#ba2121">&#39;employee&#39;</span>];
</span></span><span style="display:flex;"><span><span style="color:#19177c">$id</span><span style="color:#666">=</span><span style="color:#19177c">$_POST</span>[<span style="color:#ba2121">&#39;id&#39;</span>];
</span></span><span style="display:flex;"><span><span style="color:#408080;font-style:italic">//store the form data into session
</span></span></span><span style="display:flex;"><span><span style="color:#19177c">$_SESSION</span>[<span style="color:#ba2121">&#39;employee&#39;</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">&#39;id&#39;</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></code></code>

輸出：

<code>
<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></code></code>

編碼資料採用類似 PHP serialize() 的字串形式。

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