mirror of
https://github.com/fofolee/uTools-Manuals.git
synced 2025-06-18 13:57:03 +08:00
68 lines
2.4 KiB
HTML
68 lines
2.4 KiB
HTML
<!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>判断是否为无限值</title>
|
|
</head>
|
|
<body class="docs"><div id="layout">
|
|
<div id="layout-content"><div id="function.is-infinite" class="refentry">
|
|
<div class="refnamediv">
|
|
<h1 class="refname">is_infinite</h1>
|
|
<p class="verinfo">(PHP 4 >= 4.2.0, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">is_infinite</span> — <span class="dc-title">判断是否为无限值</span></p>
|
|
|
|
</div>
|
|
<div class="refsect1 description" id="refsect1-function.is-infinite-description">
|
|
<h3 class="title">说明</h3>
|
|
<div class="methodsynopsis dc-description">
|
|
<span class="methodname"><strong>is_infinite</strong></span>
|
|
( <span class="methodparam"><span class="type">float</span> <code class="parameter">$val</code></span>
|
|
) : <span class="type">bool</span></div>
|
|
|
|
<p class="para rdfs-comment">
|
|
如果 <code class="parameter">val</code>
|
|
为无穷大（正的或负的），例如 <em>log(0)</em>
|
|
的结果或者任何超出本平台的浮点数范围的值，则返回 <strong><code>TRUE</code></strong>。
|
|
</p>
|
|
</div>
|
|
|
|
<div class="refsect1 parameters" id="refsect1-function.is-infinite-parameters">
|
|
<h3 class="title">参数</h3>
|
|
<p class="para">
|
|
<dl>
|
|
|
|
|
|
<dt>
|
|
<code class="parameter">val</code></dt>
|
|
|
|
<dd>
|
|
|
|
<p class="para">
|
|
要检查的值
|
|
</p>
|
|
</dd>
|
|
|
|
|
|
</dl>
|
|
|
|
</p>
|
|
</div>
|
|
|
|
<div class="refsect1 returnvalues" id="refsect1-function.is-infinite-returnvalues">
|
|
<h3 class="title">返回值</h3>
|
|
<p class="para">
|
|
如果 <code class="parameter">val</code>
|
|
为无穷大返回 <strong><code>TRUE</code></strong>，否则返回 <strong><code>FALSE</code></strong>。
|
|
</p>
|
|
</div>
|
|
|
|
<div class="refsect1 seealso" id="refsect1-function.is-infinite-seealso">
|
|
<h3 class="title">参见</h3>
|
|
<p class="para">
|
|
<ul class="simplelist">
|
|
<li class="member"><span class="function"><a href="is_finite.html" class="function" rel="rdfs-seeAlso">is_finite()</a> - 判断是否为有限值</span></li>
|
|
<li class="member"><span class="function"><a href="is_nan.html" class="function" rel="rdfs-seeAlso">is_nan()</a> - 判断是否为合法数值</span></li>
|
|
</ul>
|
|
</p>
|
|
</div>
|
|
|
|
</div></div></div></body></html> |