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91 lines
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HTML
91 lines
5.0 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>Verify that the contents of a variable is an iterable value</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.is-iterable" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">is_iterable</h1>
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<p class="verinfo">(PHP 7 >= 7.1.0)</p><p class="refpurpose"><span class="refname">is_iterable</span> — <span class="dc-title">
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Verify that the contents of a variable is an iterable value
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</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.is-iterable-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>is_iterable</strong></span>
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( <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>
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) : <span class="type">bool</span></div>
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<p class="para rdfs-comment">
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Verify that the contents of a variable is accepted by the
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<span class="type"><a href="language.types.iterable.html" class="type iterable">iterable</a></span> pseudo_type, i.e. that it is an <span class="type"><a href="language.types.array.html" class="type array">array</a></span> or
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an object implementing <strong class="classname">Traversable</strong>
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.is-iterable-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">var</code></dt>
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<dd>
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<p class="para">
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The value to check
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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.is-iterable-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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Returns <strong><code>TRUE</code></strong> if <code class="parameter">var</code> is iterable, <strong><code>FALSE</code></strong>
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otherwise.
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.is-iterable-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-6364">
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<p><strong>Example #1 <span class="function"><strong>is_iterable()</strong></span> examples</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 />var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">is_iterable</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_iterable</span><span style="color: #007700">(new </span><span style="color: #0000BB">ArrayIterator</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_iterable</span><span style="color: #007700">((function () { </span><span style="color: #0000BB">yield 1</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_iterable</span><span style="color: #007700">(</span><span style="color: #0000BB">1</span><span style="color: #007700">)); </span><span style="color: #FF8000">// bool(false)<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">is_iterable</span><span style="color: #007700">(new </span><span style="color: #0000BB">stdClass</span><span style="color: #007700">())); </span><span style="color: #FF8000">// bool(false)<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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</p>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.is-iterable-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="is_array.html" class="function" rel="rdfs-seeAlso">is_array()</a> - 检测变量是否是数组</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> |