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86 lines
3.3 KiB
HTML
86 lines
3.3 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>获取密码iv长度</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.openssl-cipher-iv-length" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">openssl_cipher_iv_length</h1>
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<p class="verinfo">(PHP 5 >= 5.3.3, PHP 7)</p><p class="refpurpose"><span class="refname">openssl_cipher_iv_length</span> — <span class="dc-title">获取密码iv长度</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.openssl-cipher-iv-length-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>openssl_cipher_iv_length</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$method</code></span>
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) : <span class="type">int</span></div>
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<p class="para rdfs-comment">
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获取密码初始化向量(iv)长度。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.openssl-cipher-iv-length-parameters">
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<h3 class="title">参数</h3>
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<dl>
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<dt>
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<code class="parameter">method</code></dt>
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<dd>
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<p class="para">
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密码的方法，更多值查看 <span class="function"><a href="openssl_get_cipher_methods.html" class="function">openssl_get_cipher_methods()</a></span> 函数。
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</p>
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</dd>
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</dl>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.openssl-cipher-iv-length-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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成功，返回密码长度, 失败返回 <strong><code>FALSE</code></strong> .
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</p>
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</div>
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<div class="refsect1 errors" id="refsect1-function.openssl-cipher-iv-length-errors">
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<h3 class="title">错误／异常</h3>
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<p class="para">
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当密码方法未知时，抛出一个<strong><code>E_WARNING</code></strong> 级的错误。
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.openssl-cipher-iv-length-examples">
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<h3 class="title">范例</h3>
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<div class="example" id="example-922">
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<p><strong>Example #1 <span class="function"><strong>openssl_cipher_iv_length()</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 />$method </span><span style="color: #007700">= </span><span style="color: #DD0000">'AES-128-CBC'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$ivlen </span><span style="color: #007700">= </span><span style="color: #0000BB">openssl_cipher_iv_length</span><span style="color: #007700">(</span><span style="color: #0000BB">$method</span><span style="color: #007700">);<br /><br />echo </span><span style="color: #0000BB">$ivlen</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>以上例程的输出类似于：</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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16
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</pre></div>
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</div>
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</div>
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</div>
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</div></div></div></body></html> |