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118 lines
5.1 KiB
HTML
118 lines
5.1 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>计算字符串的 MD5 散列值</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.md5" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">md5</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">md5</span> — <span class="dc-title">计算字符串的 MD5 散列值</span></p>
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</div>
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<div id="function.md5-refsynopsisdiv">
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<div class="warning"><strong class="warning">Warning</strong>
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<p class="para">
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It is not recommended to use this function to secure passwords,
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due to the fast nature of this hashing algorithm. See the
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<a href="faq.passwords.html#faq.passwords.fasthash" class="link">Password Hashing FAQ</a>
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for details and best practices.
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</p>
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</div>
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</div>
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<div class="refsect1 description" id="refsect1-function.md5-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>md5</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$str</code></span>
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[, <span class="methodparam"><span class="type">bool</span> <code class="parameter">$raw_output</code><span class="initializer"> = <strong><code>FALSE</code></strong></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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使用 <a href="http://www.faqs.org/rfcs/rfc1321" class="link external">» RSA 数据安全公司的 MD5 报文算法</a>计算 <code class="parameter">str</code> 的 MD5 散列值。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.md5-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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原始字符串。
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</p>
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</dd>
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<dt>
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<code class="parameter">raw_output</code></dt>
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<dd>
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<p class="para">
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如果可选的 <code class="parameter">raw_output</code> 被设置为 <strong><code>TRUE</code></strong>，那么 MD5 报文摘要将以16字节长度的原始二进制格式返回。
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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.md5-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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以 32 字符十六进制数字形式返回散列值。
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.md5-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-5921">
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<p><strong>Example #1 <span class="function"><strong>md5()</strong></span> 范例</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 />$str </span><span style="color: #007700">= </span><span style="color: #DD0000">'apple'</span><span style="color: #007700">;<br /><br />if (</span><span style="color: #0000BB">md5</span><span style="color: #007700">(</span><span style="color: #0000BB">$str</span><span style="color: #007700">) === </span><span style="color: #DD0000">'1f3870be274f6c49b3e31a0c6728957f'</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">"Would you like a green or red apple?"</span><span style="color: #007700">;<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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</div>
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<div class="refsect1 seealso" id="refsect1-function.md5-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="md5_file.html" class="function" rel="rdfs-seeAlso">md5_file()</a> - 计算指定文件的 MD5 散列值</span></li>
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<li class="member"><span class="function"><a href="sha1_file.html" class="function" rel="rdfs-seeAlso">sha1_file()</a> - 计算文件的 sha1 散列值</span></li>
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<li class="member"><span class="function"><a href="crc32.html" class="function" rel="rdfs-seeAlso">crc32()</a> - 计算一个字符串的 crc32 多项式</span></li>
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<li class="member"><span class="function"><a href="sha1.html" class="function" rel="rdfs-seeAlso">sha1()</a> - 计算字符串的 sha1 散列值</span></li>
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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="crypt.html" class="function" rel="rdfs-seeAlso">crypt()</a> - 单向字符串散列</span></li>
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<li class="member"><span class="function"><a href="password_hash.html" class="function" rel="rdfs-seeAlso">password_hash()</a> - 创建密码的散列（hash）</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> |