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164 lines
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HTML
164 lines
11 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>从已存储的表示中创建 PHP 的值</title>
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</head>
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<body class="docs"><div id="layout">
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<div id="layout-content"><div id="function.unserialize" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">unserialize</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">unserialize</span> — <span class="dc-title">
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从已存储的表示中创建 PHP 的值
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</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.unserialize-description">
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<h3 class="title">说明</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>unserialize</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$str</code></span>
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) : <span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span></div>
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<p class="simpara">
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<span class="function"><strong>unserialize()</strong></span> 对单一的已序列化的变量进行操作，将其转换回
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PHP 的值。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.unserialize-parameters">
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<h3 class="title">参数</h3>
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<p class="para">
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<dl>
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<dt>
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<code class="parameter">str</code></dt>
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<dd>
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<p class="para">
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序列化后的字符串。
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</p>
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<p class="para">
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若被解序列化的变量是一个对象，在成功地重新构造对象之后，PHP
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会自动地试图去调用 <a href="language.oop5.magic.html#object.wakeup" class="link">__wakeup()</a>
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成员函数（如果存在的话）。
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</p>
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<p class="para">
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<strong>unserialize_callback_func 指令</strong><br />
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<p class="para">
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如果在解序列化的时候需要实例化一个未定义类，则可以设置回调函数以供调用（以免得到的是不完整的
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<span class="type"><a href="language.types.object.html" class="type object">object</a></span> “__PHP_Incomplete_Class”）。可通过
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<var class="filename">php.ini</var>、<span class="function"><a href="ini_set.html" class="function">ini_set()</a></span> 或 <var class="filename">.htaccess</var>
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定义‘unserialize_callback_func’。每次实例化一个未定义类时它都会被调用。若要禁止这个特性，只需置空此设定。
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</p>
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</p></blockquote>
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</p>
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</dd>
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</dl>
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.unserialize-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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返回的是转换之后的值，可为
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<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>、<span class="type"><a href="language.types.float.html" class="type float">float</a></span>、<span class="type"><a href="language.types.string.html" class="type string">string</a></span>、<span class="type"><a href="language.types.array.html" class="type array">array</a></span>
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或 <span class="type"><a href="language.types.object.html" class="type object">object</a></span>。
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</p>
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<p class="para">
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如果传递的字符串不可解序列化，则返回 <strong><code>FALSE</code></strong>，并产生一个 <strong><code>E_NOTICE</code></strong>。
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</p>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.unserialize-changelog">
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<h3 class="title">更新日志</h3>
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<p class="para">
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<table class="doctable informaltable">
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<thead>
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<tr>
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<th>版本</th>
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<th>说明</th>
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</tr>
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</thead>
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<tbody class="tbody">
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<tr>
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<td>4.2.0</td>
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<td>
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添加了 unserialize_callback_func 指令。
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</td>
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</tr>
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</tbody>
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</table>
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.unserialize-examples">
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<h3 class="title">范例</h3>
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<p class="para">
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<div class="example" id="example-6371">
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<p><strong>Example #1 <span class="function"><strong>unserialize()</strong></span> 例子</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br /></span><span style="color: #FF8000">// 这里，我们使用 unserialize() 装载来自数据库的 $session_data 数组中的会话数据。<br />// 此例是描述 serialize() 的那个例子的补充。<br /><br /></span><span style="color: #0000BB">$conn </span><span style="color: #007700">= </span><span style="color: #0000BB">odbc_connect</span><span style="color: #007700">(</span><span style="color: #DD0000">"webdb"</span><span style="color: #007700">, </span><span style="color: #DD0000">"php"</span><span style="color: #007700">, </span><span style="color: #DD0000">"chicken"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$stmt </span><span style="color: #007700">= </span><span style="color: #0000BB">odbc_prepare</span><span style="color: #007700">(</span><span style="color: #0000BB">$conn</span><span style="color: #007700">, </span><span style="color: #DD0000">"SELECT data FROM sessions WHERE id = ?"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$sqldata </span><span style="color: #007700">= array(</span><span style="color: #0000BB">$_SERVER</span><span style="color: #007700">[</span><span style="color: #DD0000">'PHP_AUTH_USER'</span><span style="color: #007700">]);<br />if (!</span><span style="color: #0000BB">odbc_execute</span><span style="color: #007700">(</span><span style="color: #0000BB">$stmt</span><span style="color: #007700">, </span><span style="color: #0000BB">$sqldata</span><span style="color: #007700">) || !</span><span style="color: #0000BB">odbc_fetch_into</span><span style="color: #007700">(</span><span style="color: #0000BB">$stmt</span><span style="color: #007700">, </span><span style="color: #0000BB">$tmp</span><span style="color: #007700">)) {<br /> </span><span style="color: #FF8000">// 如果执行出错或返回错误，则初始化为空数组<br /> </span><span style="color: #0000BB">$session_data </span><span style="color: #007700">= array();<br />} else {<br /> </span><span style="color: #FF8000">// 现在我们需要的是 $tmp[0] 中已序列化的数据。<br /> </span><span style="color: #0000BB">$session_data </span><span style="color: #007700">= </span><span style="color: #0000BB">unserialize</span><span style="color: #007700">(</span><span style="color: #0000BB">$tmp</span><span style="color: #007700">[</span><span style="color: #0000BB">0</span><span style="color: #007700">]);<br /> if (!</span><span style="color: #0000BB">is_array</span><span style="color: #007700">(</span><span style="color: #0000BB">$session_data</span><span style="color: #007700">)) {<br /> </span><span style="color: #FF8000">// 出错，初始化为空数组<br /> </span><span style="color: #0000BB">$session_data </span><span style="color: #007700">= array();<br /> }<br />}<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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</div>
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</p>
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<p class="para">
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<div class="example" id="example-6372">
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<p><strong>Example #2 unserialize_callback_func 例子</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br />$serialized_object</span><span style="color: #007700">=</span><span style="color: #DD0000">'O:1:"a":1:{s:5:"value";s:3:"100";}'</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">// unserialize_callback_func 从 PHP 4.2.0 起可用<br /></span><span style="color: #0000BB">ini_set</span><span style="color: #007700">(</span><span style="color: #DD0000">'unserialize_callback_func'</span><span style="color: #007700">, </span><span style="color: #DD0000">'mycallback'</span><span style="color: #007700">); </span><span style="color: #FF8000">// 设置您的回调函数<br /><br /></span><span style="color: #007700">function </span><span style="color: #0000BB">mycallback</span><span style="color: #007700">(</span><span style="color: #0000BB">$classname</span><span style="color: #007700">) <br />{<br /> </span><span style="color: #FF8000">// 只需包含含有类定义的文件<br /> // $classname 指出需要的是哪一个类<br /></span><span style="color: #007700">}<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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</div>
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</p>
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</div>
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<div class="refsect1 notes" id="refsect1-function.unserialize-notes">
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<h3 class="title">注释</h3>
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<div class="warning"><strong class="warning">Warning</strong>
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<p class="para">
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如果反序列化了 <strong><code>FALSE</code></strong> 的值，或者在过程中发生了错误，都会返回 <strong><code>FALSE</code></strong>。
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可以通过 <code class="parameter">str</code> 和 <em>serialize(false)</em> 进行比较，或者捕捉 <strong><code>E_NOTICE</code></strong> 错误来判断这种特殊情况。
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</p>
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</div>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.unserialize-seealso">
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<h3 class="title">参见</h3>
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<p class="para">
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<ul class="simplelist">
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<li class="member"><span class="function"><a href="serialize.html" class="function" rel="rdfs-seeAlso">serialize()</a> - 产生一个可存储的值的表示</span></li>
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<li class="member"><a href="language.oop5.autoload.html" class="link">自动加载对象</a></li>
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<li class="member"><a href="var.configuration.html#unserialize-callback-func" class="link">unserialize_callback_func</a></li>
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<li class="member"><a href="language.oop5.magic.html#object.wakeup" class="link">__wakeup()</a></li>
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</ul>
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</p>
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</div>
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</div></div></div></body></html> |