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68 lines
4.3 KiB
HTML
68 lines
4.3 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>显示随机数的最大可能值</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.mt-getrandmax" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">mt_getrandmax</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">mt_getrandmax</span> — <span class="dc-title">显示随机数的最大可能值</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.mt-getrandmax-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>mt_getrandmax</strong></span>
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( <span class="methodparam">void</span>
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) : <span class="type">int</span></div>
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<p class="simpara">
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返回调用
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<span class="function"><a href="mt_rand.html" class="function">mt_rand()</a></span> 所能返回的最大的随机数。
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.mt-getrandmax-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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返回调用
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<span class="function"><a href="mt_rand.html" class="function">mt_rand()</a></span> 所能返回的最大的随机数。
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.mt-getrandmax-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-4134"><p><strong>Example #1 计算一个随机浮点数</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: #007700">function </span><span style="color: #0000BB">randomFloat</span><span style="color: #007700">(</span><span style="color: #0000BB">$min </span><span style="color: #007700">= </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">$max </span><span style="color: #007700">= </span><span style="color: #0000BB">1</span><span style="color: #007700">) {<br /> return </span><span style="color: #0000BB">$min </span><span style="color: #007700">+ </span><span style="color: #0000BB">mt_rand</span><span style="color: #007700">() / </span><span style="color: #0000BB">mt_getrandmax</span><span style="color: #007700">() * (</span><span style="color: #0000BB">$max </span><span style="color: #007700">- </span><span style="color: #0000BB">$min</span><span style="color: #007700">);<br />}<br /><br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">randomFloat</span><span style="color: #007700">());<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">randomFloat</span><span style="color: #007700">(</span><span style="color: #0000BB">2</span><span style="color: #007700">, </span><span style="color: #0000BB">20</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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float(0.91601131712832)
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float(16.511210331931)
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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.mt-getrandmax-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="mt_rand.html" class="function" rel="rdfs-seeAlso">mt_rand()</a> - 生成更好的随机数</span></li>
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<li class="member"><span class="function"><a href="mt_srand.html" class="function" rel="rdfs-seeAlso">mt_srand()</a> - 播下一个更好的随机数发生器种子</span></li>
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<li class="member"><span class="function"><a href="getrandmax.html" class="function" rel="rdfs-seeAlso">getrandmax()</a> - 显示随机数最大的可能值</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> |