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134 lines
4.4 KiB
HTML
134 lines
4.4 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>对使用 MIME base64 编码的数据进行解码</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.base64-decode" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">base64_decode</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">base64_decode</span> — <span class="dc-title">对使用 MIME base64 编码的数据进行解码</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.base64-decode-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>base64_decode</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$data</code></span>
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[, <span class="methodparam"><span class="type">bool</span> <code class="parameter">$strict</code><span class="initializer"> = false</span></span>
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] ) : <span class="type">string</span></div>
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<p class="para rdfs-comment">
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对 base64 编码的 <code class="parameter">data</code> 进行解码。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.base64-decode-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">data</code></dt>
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<dd>
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<p class="para">
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编码过的数据。
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</p>
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</dd>
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<dt>
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<code class="parameter">strict</code></dt>
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<dd>
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<p class="para">
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当设置 <code class="parameter">strict</code> 为 <strong><code>TRUE</code></strong> 时，一旦输入的数据超出了 base64 字母表，将返回 <strong><code>FALSE</code></strong>。
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否则会静默丢弃无效的字符。
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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.base64-decode-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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返回原始数据， 或者在失败时返回 <strong><code>FALSE</code></strong>。返回的数据可能是二进制的。
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</p>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.base64-decode-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>5.2.0</td>
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<td>增加了 <code class="parameter">strict</code> 。</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.base64-decode-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-4881">
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<p><strong>Example #1 <span class="function"><strong>base64_decode()</strong></span> 示例</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 />$str </span><span style="color: #007700">= </span><span style="color: #DD0000">'VGhpcyBpcyBhbiBlbmNvZGVkIHN0cmluZw=='</span><span style="color: #007700">;<br />echo </span><span style="color: #0000BB">base64_decode</span><span style="color: #007700">(</span><span style="color: #0000BB">$str</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 class="example-contents"><p>以上例程会输出：</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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This is an encoded string
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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 seealso" id="refsect1-function.base64-decode-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="base64_encode.html" class="function" rel="rdfs-seeAlso">base64_encode()</a> - 使用 MIME base64 对数据进行编码</span></li>
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<li class="member">
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<a href="http://www.faqs.org/rfcs/rfc2045" class="link external">» RFC 2045</a> 的 6.8 章节。
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</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> |