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172 lines
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HTML
172 lines
11 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>Set bit</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-setbit" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">gmp_setbit</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_setbit</span> — <span class="dc-title">Set bit</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.gmp-setbit-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_setbit</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">$a</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$index</code></span>
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[, <span class="methodparam"><span class="type">bool</span> <code class="parameter">$bit_on</code><span class="initializer"> = <strong><code>TRUE</code></strong></span></span>
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] ) : <span class="type"><span class="type void">void</span></span></div>
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<p class="para rdfs-comment">
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Sets bit <code class="parameter">index</code> in <code class="parameter">a</code>.
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.gmp-setbit-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 value to modify.
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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">index</code></dt>
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<dd>
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<p class="para">
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The index of the bit to set. Index 0 represents the least significant bit.
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</p>
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</dd>
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<dt>
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<code class="parameter">bit_on</code></dt>
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<dd>
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<p class="para">
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True to set the bit (set it to 1/on); false to clear the bit (set it to 0/off).
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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-setbit-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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GMP 数值<span class="type"><span class="type 资源">资源</span></span>.
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.gmp-setbit-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-4099">
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<p><strong>Example #1 <span class="function"><strong>gmp_setbit()</strong></span> example - 0 index</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 />$a </span><span style="color: #007700">= </span><span style="color: #0000BB">gmp_init</span><span style="color: #007700">(</span><span style="color: #DD0000">"2"</span><span style="color: #007700">); </span><span style="color: #FF8000">//<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">gmp_strval</span><span style="color: #007700">(</span><span style="color: #0000BB">$a</span><span style="color: #007700">), </span><span style="color: #DD0000">' -> 0b'</span><span style="color: #007700">, </span><span style="color: #0000BB">gmp_strval</span><span style="color: #007700">(</span><span style="color: #0000BB">$a</span><span style="color: #007700">, </span><span style="color: #0000BB">2</span><span style="color: #007700">), </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">gmp_setbit</span><span style="color: #007700">(</span><span style="color: #0000BB">$a</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">); </span><span style="color: #FF8000">// 0b10 now becomes 0b11<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">gmp_strval</span><span style="color: #007700">(</span><span style="color: #0000BB">$a</span><span style="color: #007700">), </span><span style="color: #DD0000">' -> 0b'</span><span style="color: #007700">, </span><span style="color: #0000BB">gmp_strval</span><span style="color: #007700">(</span><span style="color: #0000BB">$a</span><span style="color: #007700">, </span><span style="color: #0000BB">2</span><span style="color: #007700">), </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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<div class="example-contents"><p>以上例程会输出：</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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2 -> 0b10
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3 -> 0b11
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</pre></div>
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</div>
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</div>
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<div class="example" id="example-4100">
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<p><strong>Example #2 <span class="function"><strong>gmp_setbit()</strong></span> example - 1 index</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br />$a </span><span style="color: #007700">= </span><span style="color: #0000BB">gmp_init</span><span style="color: #007700">(</span><span style="color: #DD0000">"0xfd"</span><span style="color: #007700">);<br />echo </span><span style="color: #0000BB">gmp_strval</span><span style="color: #007700">(</span><span style="color: #0000BB">$a</span><span style="color: #007700">), </span><span style="color: #DD0000">' -> 0b'</span><span style="color: #007700">, </span><span style="color: #0000BB">gmp_strval</span><span style="color: #007700">(</span><span style="color: #0000BB">$a</span><span style="color: #007700">, </span><span style="color: #0000BB">2</span><span style="color: #007700">), </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">gmp_setbit</span><span style="color: #007700">(</span><span style="color: #0000BB">$a</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">); </span><span style="color: #FF8000">// index starts at 0<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">gmp_strval</span><span style="color: #007700">(</span><span style="color: #0000BB">$a</span><span style="color: #007700">), </span><span style="color: #DD0000">' -> 0b'</span><span style="color: #007700">, </span><span style="color: #0000BB">gmp_strval</span><span style="color: #007700">(</span><span style="color: #0000BB">$a</span><span style="color: #007700">, </span><span style="color: #0000BB">2</span><span style="color: #007700">), </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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<div class="example-contents"><p>以上例程会输出：</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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253 -> 0b11111101
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255 -> 0b11111111
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</pre></div>
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</div>
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</div>
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<div class="example" id="example-4101">
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<p><strong>Example #3 <span class="function"><strong>gmp_setbit()</strong></span> example - clearing a bit</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br />$a </span><span style="color: #007700">= </span><span style="color: #0000BB">gmp_init</span><span style="color: #007700">(</span><span style="color: #DD0000">"0xff"</span><span style="color: #007700">);<br />echo </span><span style="color: #0000BB">gmp_strval</span><span style="color: #007700">(</span><span style="color: #0000BB">$a</span><span style="color: #007700">), </span><span style="color: #DD0000">' -> 0b'</span><span style="color: #007700">, </span><span style="color: #0000BB">gmp_strval</span><span style="color: #007700">(</span><span style="color: #0000BB">$a</span><span style="color: #007700">, </span><span style="color: #0000BB">2</span><span style="color: #007700">), </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">gmp_setbit</span><span style="color: #007700">(</span><span style="color: #0000BB">$a</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">false</span><span style="color: #007700">); </span><span style="color: #FF8000">// clear bit at index 0<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">gmp_strval</span><span style="color: #007700">(</span><span style="color: #0000BB">$a</span><span style="color: #007700">), </span><span style="color: #DD0000">' -> 0b'</span><span style="color: #007700">, </span><span style="color: #0000BB">gmp_strval</span><span style="color: #007700">(</span><span style="color: #0000BB">$a</span><span style="color: #007700">, </span><span style="color: #0000BB">2</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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255 -> 0b11111111
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254 -> 0b11111110
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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 notes" id="refsect1-function.gmp-setbit-notes">
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<h3 class="title">注释</h3>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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Unlike most of the other GMP functions, <span class="function"><strong>gmp_setbit()</strong></span>
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must be called with a GMP resource that already exists (using
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<span class="function"><a href="gmp_init.html" class="function">gmp_init()</a></span> for example). One will not be
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automatically created.
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</p>
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</p></blockquote>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.gmp-setbit-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="gmp_clrbit.html" class="function" rel="rdfs-seeAlso">gmp_clrbit()</a> - Clear bit</span></li>
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<li class="member"><span class="function"><a href="gmp_testbit.html" class="function" rel="rdfs-seeAlso">gmp_testbit()</a> - Tests if a bit is set</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> |