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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>Negate number</title>
</head>
<body class="docs"><div id="layout">
<div id="layout-content"><div id="function.gmp-neg" class="refentry">
<div class="refnamediv">
<h1 class="refname">gmp_neg</h1>
<p class="verinfo">(PHP 4 &gt;= 4.0.4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">gmp_neg</span> &mdash; <span class="dc-title">Negate number</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.gmp-neg-description">
<h3 class="title">说明</h3>
<div class="methodsynopsis dc-description">
<span class="methodname"><strong>gmp_neg</strong></span>
( <span class="methodparam"><span class="type"><a href="class.gmp.html" class="type GMP">GMP</a></span> <code class="parameter">$a</code></span>
) : <span class="type"><a href="class.gmp.html" class="type GMP">GMP</a></span></div>
<p class="para rdfs-comment">
Returns the negative value of a number.
</p>
</div>
<div class="refsect1 parameters" id="refsect1-function.gmp-neg-parameters">
<h3 class="title">参数</h3>
<p class="para">
<dl>
<dt>
<code class="parameter">a</code></dt>
<dd>
<p class="para">可以是一个 GMP
数据 <span class="type"><span class="type resouce">resouce</span></span>，或一个可以转换为数值的字符串。</p>
</dd>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.gmp-neg-returnvalues">
<h3 class="title">返回值</h3>
<p class="para">
Returns -<code class="parameter">a</code>, as a GMP number.
</p>
</div>
<div class="refsect1 examples" id="refsect1-function.gmp-neg-examples">
<h3 class="title">范例</h3>
<p class="para">
<div class="example" id="example-4085">
<p><strong>Example #1 <span class="function"><strong>gmp_neg()</strong></span> example</strong></p>
<div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$neg1&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">gmp_neg</span><span style="color: #007700">(</span><span style="color: #DD0000">"1"</span><span style="color: #007700">);<br />echo&nbsp;</span><span style="color: #0000BB">gmp_strval</span><span style="color: #007700">(</span><span style="color: #0000BB">$neg1</span><span style="color: #007700">)&nbsp;.&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$neg2&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">gmp_neg</span><span style="color: #007700">(</span><span style="color: #DD0000">"-1"</span><span style="color: #007700">);<br />echo&nbsp;</span><span style="color: #0000BB">gmp_strval</span><span style="color: #007700">(</span><span style="color: #0000BB">$neg2</span><span style="color: #007700">)&nbsp;.&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
</div>
<div class="example-contents"><p>以上例程会输出：</p></div>
<div class="example-contents screen">
<div class="cdata"><pre>
-1
1
</pre></div>
</div>
</div>
</p>
</div>
</div></div></div></body></html>