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158 lines
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HTML
158 lines
6.8 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>初始化增量哈希运算上下文</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.hash-init" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">hash_init</h1>
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<p class="verinfo">(PHP 5 >= 5.1.2, PHP 7, PECL hash >= 1.1)</p><p class="refpurpose"><span class="refname">hash_init</span> — <span class="dc-title">初始化增量哈希运算上下文</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.hash-init-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>hash_init</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$algo</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$options</code><span class="initializer"> = 0</span></span>
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[, <span class="methodparam"><span class="type">string</span> <code class="parameter">$key</code><span class="initializer"> = <strong><code>NULL</code></strong></span></span>
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]] ) : <span class="type"><span class="type HashContext">HashContext</span></span></div>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.hash-init-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">algo</code></dt>
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<dd>
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<p class="para">
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要使用的哈希算法名称，例如："md5"，"sha256"，"haval160,4" 等。
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如何获取受支持的算法清单，请参见 <span class="function"><a href="hash_algos.html" class="function">hash_algos()</a></span>。
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</p>
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</dd>
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<dt>
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<code class="parameter">options</code></dt>
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<dd>
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<p class="para">
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进行哈希运算的可选设置，目前仅支持一个选项：<strong><code>HASH_HMAC</code></strong>。
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当指定此选项的时候，<em class="emphasis">必须</em> 指定 <code class="parameter">key</code> 参数。
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</p>
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</dd>
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<dt>
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<code class="parameter">key</code></dt>
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<dd>
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<p class="para">
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当 <code class="parameter">options</code> 参数为 <strong><code>HASH_HMAC</code></strong> 时，
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使用此参数传入进行 HMAC 哈希运算时的共享密钥。
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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.hash-init-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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返回哈希运算上下文对象，以供
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<span class="function"><a href="hash_update.html" class="function">hash_update()</a></span>，
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<span class="function"><a href="hash_update_stream.html" class="function">hash_update_stream()</a></span>，<span class="function"><a href="hash_update_file.html" class="function">hash_update_file()</a></span>,
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和 <span class="function"><a href="hash_final.html" class="function">hash_final()</a></span> 函数使用。
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</p>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.hash-init-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>7.2.0</td>
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<td>当使用 <strong><code>HASH_HMAC</code></strong> 选项的时候，不再支持非加密的哈希函数（adler32，crc32，crc32b，fnv132，fnv1a32，fnv164，fnv1a64，joaat）。</td>
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</tr>
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<tr>
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<td>7.2.0</td>
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<td>
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返回 <strong class="classname">HashContext</strong> 对象，不再返回资源类型。
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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.hash-init-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="zlib-encode.example.basic">
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<p><strong>Example #1 增量哈希运算例程</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 />$ctx </span><span style="color: #007700">= </span><span style="color: #0000BB">hash_init</span><span style="color: #007700">(</span><span style="color: #DD0000">'md5'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">hash_update</span><span style="color: #007700">(</span><span style="color: #0000BB">$ctx</span><span style="color: #007700">, </span><span style="color: #DD0000">'The quick brown fox '</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">hash_update</span><span style="color: #007700">(</span><span style="color: #0000BB">$ctx</span><span style="color: #007700">, </span><span style="color: #DD0000">'jumped over the lazy dog.'</span><span style="color: #007700">);<br />echo </span><span style="color: #0000BB">hash_final</span><span style="color: #007700">(</span><span style="color: #0000BB">$ctx</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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5c6ffbdd40d9556b73a21e63c3e0e904
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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.hash-init-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="hash.html" class="function" rel="rdfs-seeAlso">hash()</a> - 生成哈希值 （消息摘要）</span></li>
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<li class="member"><span class="function"><a href="hash_algos.html" class="function" rel="rdfs-seeAlso">hash_algos()</a> - 返回已注册的哈希算法列表</span></li>
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<li class="member"><span class="function"><a href="hash_file.html" class="function" rel="rdfs-seeAlso">hash_file()</a> - 使用给定文件的内容生成哈希值</span></li>
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<li class="member"><span class="function"><a href="hash_hmac.html" class="function" rel="rdfs-seeAlso">hash_hmac()</a> - 使用 HMAC 方法生成带有密钥的哈希值</span></li>
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<li class="member"><span class="function"><a href="hash_hmac_file.html" class="function" rel="rdfs-seeAlso">hash_hmac_file()</a> - 使用 HMAC 方法和给定文件的内容生成带密钥的哈希值</span></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> |