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98 lines
4.6 KiB
HTML
98 lines
4.6 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>Random number</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.gmp-random" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">gmp_random</h1>
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<p class="verinfo">(PHP 4 >= 4.0.4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">gmp_random</span> — <span class="dc-title">Random number</span></p>
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</div>
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<div id="function.gmp-random-refsynopsisdiv">
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<div class="warning"><strong class="warning">Warning</strong><p class="simpara">This function has been
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<em class="emphasis">DEPRECATED</em> as of PHP 7.2.0. Relying on this function
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is highly discouraged.</p></div>
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</div>
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<div class="refsect1 description" id="refsect1-function.gmp-random-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>gmp_random</strong></span>
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([ <span class="methodparam"><span class="type">int</span> <code class="parameter">$limiter</code><span class="initializer"> = 20</span></span>
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] ) : <span class="type"><a href="class.gmp.html" class="type GMP">GMP</a></span></div>
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<p class="para rdfs-comment">
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Generate a random number. The number will be between 0 and (2 ** n) - 1,
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where n is the number of bits per limb multiplied by <code class="parameter">limiter</code>.
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If <code class="parameter">limiter</code> is negative, negative numbers are generated.
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</p>
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<p class="para">
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A limb is an internal GMP mechanism. The number of bits in a limb is
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not static, and can vary from system to system. Generally, the number
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of bits in a limb is either 32 or 64, but this is not guaranteed.
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.gmp-random-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">limiter</code></dt>
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<dd>
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<p class="para">
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The limiter.
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</p>
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<p class="para">可以是一个 GMP
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数据 <span class="type"><span class="type resouce">resouce</span></span>，或一个可以转换为数值的字符串。</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.gmp-random-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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A random GMP number.
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.gmp-random-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-4096">
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<p><strong>Example #1 <span class="function"><strong>gmp_random()</strong></span> example</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 />$rand1 </span><span style="color: #007700">= </span><span style="color: #0000BB">gmp_random</span><span style="color: #007700">(</span><span style="color: #0000BB">1</span><span style="color: #007700">); </span><span style="color: #FF8000">// random number from 0 to 1 * bits per limb<br /></span><span style="color: #0000BB">$rand2 </span><span style="color: #007700">= </span><span style="color: #0000BB">gmp_random</span><span style="color: #007700">(</span><span style="color: #0000BB">2</span><span style="color: #007700">); </span><span style="color: #FF8000">// random number from 0 to 2 * bits per limb<br /><br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">gmp_strval</span><span style="color: #007700">(</span><span style="color: #0000BB">$rand1</span><span style="color: #007700">) . </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />echo </span><span style="color: #0000BB">gmp_strval</span><span style="color: #007700">(</span><span style="color: #0000BB">$rand2</span><span style="color: #007700">) . </span><span style="color: #DD0000">"\n"</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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1915834968
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8642564075890328087
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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></div></div></body></html> |