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103 lines
4.3 KiB
HTML
103 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>比较两个任意精度的数字</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.bccomp" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">bccomp</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">bccomp</span> — <span class="dc-title">比较两个任意精度的数字</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.bccomp-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>bccomp</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$left_operand</code></span>
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, <span class="methodparam"><span class="type">string</span> <code class="parameter">$right_operand</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$scale</code><span class="initializer"> = int</span></span>
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] ) : <span class="type">int</span></div>
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<p class="para rdfs-comment">
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把<code class="parameter">right_operand</code>和<code class="parameter">left_operand</code>作比较,
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并且返回一个整数的结果.
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.bccomp-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">left_operand</code></dt>
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<dd>
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<p class="para">
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左边的运算数, 是一个字符串.
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</p>
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</dd>
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<dt>
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<code class="parameter">right_operand</code></dt>
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<dd>
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<p class="para">
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右边的运算数, 是一个字符串.
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</p>
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</dd>
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<dt>
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<code class="parameter">scale</code></dt>
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<dd>
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<p class="para">
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可选的<code class="parameter">scale</code>参数被用作设置指示数字，
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在使用来作比较的小数点部分.
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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.bccomp-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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如果两个数相等返回0,
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左边的数<code class="parameter">left_operand</code>比较右边的数<code class="parameter">right_operand</code>大返回1,
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否则返回-1.
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.bccomp-examples">
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<h3 class="title">范例</h3>
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<div class="example" id="example-4052">
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<p><strong>Example #1 <span class="function"><strong>bccomp()</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 /><br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">bccomp</span><span style="color: #007700">(</span><span style="color: #DD0000">'1'</span><span style="color: #007700">, </span><span style="color: #DD0000">'2'</span><span style="color: #007700">) . </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">; </span><span style="color: #FF8000">// -1<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">bccomp</span><span style="color: #007700">(</span><span style="color: #DD0000">'1.00001'</span><span style="color: #007700">, </span><span style="color: #DD0000">'1'</span><span style="color: #007700">, </span><span style="color: #0000BB">3</span><span style="color: #007700">); </span><span style="color: #FF8000">// 0<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">bccomp</span><span style="color: #007700">(</span><span style="color: #DD0000">'1.00001'</span><span style="color: #007700">, </span><span style="color: #DD0000">'1'</span><span style="color: #007700">, </span><span style="color: #0000BB">5</span><span style="color: #007700">); </span><span style="color: #FF8000">// 1<br /><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>
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</div>
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</div></div></div></body></html> |