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108 lines
5.7 KiB
HTML
108 lines
5.7 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>Sets the RNG seed</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-seed" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">gmp_random_seed</h1>
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<p class="verinfo">(PHP 7)</p><p class="refpurpose"><span class="refname">gmp_random_seed</span> — <span class="dc-title">Sets the RNG seed</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.gmp-random-seed-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_seed</strong></span>
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( <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$seed</code></span>
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) : <span class="type"><span class="type void">void</span></span></div>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.gmp-random-seed-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">seed</code></dt>
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<dd>
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<p class="para">
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The seed to be set for the <span class="function"><a href="gmp_random.html" class="function">gmp_random()</a></span>,
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<span class="function"><a href="gmp_random_bits.html" class="function">gmp_random_bits()</a></span>, and
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<span class="function"><a href="gmp_random_range.html" class="function">gmp_random_range()</a></span> functions.
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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-seed-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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Returns <strong><code>NULL</code></strong> on success 或者在失败时返回 <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.gmp-random-seed-errors">
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<h3 class="title">错误／异常</h3>
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<p class="para">
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Issues an <strong><code>E_WARNING</code></strong> and returns <strong><code>FALSE</code></strong> if
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<code class="parameter">seed</code> is not valid.
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.gmp-random-seed-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-4095">
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<p><strong>Example #1 <span class="function"><strong>gmp_random_seed()</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 /></span><span style="color: #FF8000">// set the seed<br /></span><span style="color: #0000BB">gmp_random_seed</span><span style="color: #007700">(</span><span style="color: #0000BB">100</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">gmp_strval</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">)));<br /><br /></span><span style="color: #FF8000">// set the seed to something else<br /></span><span style="color: #0000BB">gmp_random_seed</span><span style="color: #007700">(</span><span style="color: #0000BB">gmp_init</span><span style="color: #007700">(-</span><span style="color: #0000BB">100</span><span style="color: #007700">));<br /><br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">gmp_strval</span><span style="color: #007700">(</span><span style="color: #0000BB">gmp_random_bits</span><span style="color: #007700">(</span><span style="color: #0000BB">10</span><span style="color: #007700">)));<br /><br /></span><span style="color: #FF8000">// set the seed to something invalid<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">gmp_random_seed</span><span style="color: #007700">(</span><span style="color: #DD0000">'not a number'</span><span style="color: #007700">));</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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string(20) "15370156633245019617"
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string(3) "683"
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Warning: gmp_random_seed(): Unable to convert variable to GMP - string is not an integer in %s on line %d
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bool(false)
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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.gmp-random-seed-seealso">
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<h3 class="title">参见</h3>
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<ul class="simplelist">
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<li class="member"><span class="function"><a href="gmp_init.html" class="function" rel="rdfs-seeAlso">gmp_init()</a> - Create GMP number</span></li>
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<li class="member"><span class="function"><a href="gmp_random.html" class="function" rel="rdfs-seeAlso">gmp_random()</a> - Random number</span></li>
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<li class="member"><span class="function"><a href="gmp_random_bits.html" class="function" rel="rdfs-seeAlso">gmp_random_bits()</a> - Random number</span></li>
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<li class="member"><span class="function"><a href="gmp_random_range.html" class="function" rel="rdfs-seeAlso">gmp_random_range()</a> - Random number</span></li>
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</ul>
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</div>
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</div></div></div></body></html> |