mirror of
https://github.com/fofolee/uTools-Manuals.git
synced 2025-06-18 13:57:03 +08:00
120 lines
5.6 KiB
HTML
120 lines
5.6 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>Verify that the contents of a variable is a countable value</title>
|
|
</head>
|
|
<body class="docs"><div id="layout">
|
|
<div id="layout-content"><div id="function.is-countable" class="refentry">
|
|
<div class="refnamediv">
|
|
<h1 class="refname">is_countable</h1>
|
|
<p class="verinfo">(PHP 7 >= 7.3.0)</p><p class="refpurpose"><span class="refname">is_countable</span> — <span class="dc-title">
|
|
Verify that the contents of a variable is a countable value
|
|
</span></p>
|
|
|
|
</div>
|
|
|
|
<div class="refsect1 description" id="refsect1-function.is-countable-description">
|
|
<h3 class="title">说明</h3>
|
|
<div class="methodsynopsis dc-description">
|
|
<span class="methodname"><strong>is_countable</strong></span>
|
|
( <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$var</code></span>
|
|
) : <span class="type">bool</span></div>
|
|
|
|
<p class="para rdfs-comment">
|
|
Verify that the contents of a variable is an <span class="type"><a href="language.types.array.html" class="type array">array</a></span> or
|
|
an object implementing <a href="class.countable.html" class="classname">Countable</a>
|
|
</p>
|
|
</div>
|
|
|
|
|
|
<div class="refsect1 parameters" id="refsect1-function.is-countable-parameters">
|
|
<h3 class="title">参数</h3>
|
|
<p class="para">
|
|
<dl>
|
|
|
|
|
|
<dt>
|
|
<code class="parameter">var</code></dt>
|
|
|
|
<dd>
|
|
|
|
<p class="para">
|
|
The value to check
|
|
</p>
|
|
</dd>
|
|
|
|
|
|
</dl>
|
|
|
|
</p>
|
|
</div>
|
|
|
|
|
|
<div class="refsect1 returnvalues" id="refsect1-function.is-countable-returnvalues">
|
|
<h3 class="title">返回值</h3>
|
|
<p class="para">
|
|
Returns <strong><code>TRUE</code></strong> if <code class="parameter">var</code> is countable, <strong><code>FALSE</code></strong>
|
|
otherwise.
|
|
</p>
|
|
</div>
|
|
|
|
|
|
<div class="refsect1 changelog" id="refsect1-function.is-countable-changelog">
|
|
<h3 class="title">更新日志</h3>
|
|
<table class="doctable informaltable">
|
|
|
|
<thead>
|
|
<tr>
|
|
<th>版本</th>
|
|
<th>说明</th>
|
|
</tr>
|
|
|
|
</thead>
|
|
|
|
<tbody class="tbody">
|
|
<tr>
|
|
<td>7.3.0</td>
|
|
<td>
|
|
<span class="function"><strong>is_countable()</strong></span> has been added.
|
|
</td>
|
|
</tr>
|
|
|
|
</tbody>
|
|
|
|
</table>
|
|
|
|
</div>
|
|
|
|
|
|
<div class="refsect1 examples" id="refsect1-function.is-countable-examples">
|
|
<h3 class="title">范例</h3>
|
|
<p class="para">
|
|
<div class="example" id="example-6363">
|
|
<p><strong>Example #1 <span class="function"><strong>is_countable()</strong></span> examples</strong></p>
|
|
<div class="example-contents">
|
|
<div class="phpcode"><pre><span style="color: #000000">
|
|
<span style="color: #0000BB"><?php<br />var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">is_countable</span><span style="color: #007700">([</span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">2</span><span style="color: #007700">, </span><span style="color: #0000BB">3</span><span style="color: #007700">])); </span><span style="color: #FF8000">// bool(true)<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">is_countable</span><span style="color: #007700">(new </span><span style="color: #0000BB">ArrayIterator</span><span style="color: #007700">([</span><span style="color: #DD0000">'foo'</span><span style="color: #007700">, </span><span style="color: #DD0000">'bar'</span><span style="color: #007700">, </span><span style="color: #DD0000">'baz'</span><span style="color: #007700">]))); </span><span style="color: #FF8000">// bool(true)<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">is_countable</span><span style="color: #007700">(new </span><span style="color: #0000BB">ArrayIterator</span><span style="color: #007700">())); </span><span style="color: #FF8000">// bool(true)<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">is_countable</span><span style="color: #007700">(new </span><span style="color: #0000BB">stdClass</span><span style="color: #007700">())); </span><span style="color: #FF8000">// bool(false)</span>
|
|
</span>
|
|
</pre></div>
|
|
</div>
|
|
|
|
</div>
|
|
</p>
|
|
</div>
|
|
|
|
|
|
<div class="refsect1 seealso" id="refsect1-function.is-countable-seealso">
|
|
<h3 class="title">参见</h3>
|
|
<p class="para">
|
|
<ul class="simplelist">
|
|
<li class="member"><span class="function"><a href="is_array.html" class="function" rel="rdfs-seeAlso">is_array()</a> - 检测变量是否是数组</span></li>
|
|
<li class="member"><span class="function"><a href="is_object.html" class="function" rel="rdfs-seeAlso">is_object()</a> - 检测变量是否是一个对象</span></li>
|
|
<li class="member"><span class="function"><a href="is_iterable.html" class="function" rel="rdfs-seeAlso">is_iterable()</a> - Verify that the contents of a variable is an iterable value</span></li>
|
|
<li class="member"><span class="function"><a href="is_bool.html" class="function" rel="rdfs-seeAlso">is_bool()</a> - 检测变量是否是布尔型</span></li>
|
|
</ul>
|
|
</p>
|
|
</div>
|
|
|
|
|
|
</div></div></div></body></html> |