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101 lines
4.6 KiB
HTML
101 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>Scan for 0</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-scan0" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">gmp_scan0</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_scan0</span> — <span class="dc-title">Scan for 0</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.gmp-scan0-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_scan0</strong></span>
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( <span class="methodparam"><span class="type"><a href="class.gmp.html" class="type GMP">GMP</a></span> <code class="parameter">$a</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$start</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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Scans <code class="parameter">a</code>, starting with bit
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<code class="parameter">start</code>, towards more significant bits,
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until the first clear bit is found.
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.gmp-scan0-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">a</code></dt>
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<dd>
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<p class="para">
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The number to scan.
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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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<dt>
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<code class="parameter">start</code></dt>
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<dd>
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<p class="para">
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The starting bit.
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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.gmp-scan0-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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Returns the index of the found bit, as an <span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>. The
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index starts from 0.
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.gmp-scan0-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-4097">
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<p><strong>Example #1 <span class="function"><strong>gmp_scan0()</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">// "0" bit is found at position 3. index starts at 0<br /></span><span style="color: #0000BB">$s1 </span><span style="color: #007700">= </span><span style="color: #0000BB">gmp_init</span><span style="color: #007700">(</span><span style="color: #DD0000">"10111"</span><span style="color: #007700">, </span><span style="color: #0000BB">2</span><span style="color: #007700">);<br />echo </span><span style="color: #0000BB">gmp_scan0</span><span style="color: #007700">(</span><span style="color: #0000BB">$s1</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">) . </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">// "0" bit is found at position 7. index starts at 5<br /></span><span style="color: #0000BB">$s2 </span><span style="color: #007700">= </span><span style="color: #0000BB">gmp_init</span><span style="color: #007700">(</span><span style="color: #DD0000">"101110000"</span><span style="color: #007700">, </span><span style="color: #0000BB">2</span><span style="color: #007700">);<br />echo </span><span style="color: #0000BB">gmp_scan0</span><span style="color: #007700">(</span><span style="color: #0000BB">$s2</span><span style="color: #007700">, </span><span style="color: #0000BB">5</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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3
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7
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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> |