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128 lines
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HTML
128 lines
5.3 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>为迭代器中每个元素调用一个用户自定义函数</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.iterator-apply" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">iterator_apply</h1>
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<p class="verinfo">(PHP 5 >= 5.1.0, PHP 7)</p><p class="refpurpose"><span class="refname">iterator_apply</span> — <span class="dc-title">为迭代器中每个元素调用一个用户自定义函数</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.iterator-apply-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>iterator_apply</strong></span>
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( <span class="methodparam"><span class="type"><a href="class.traversable.html" class="type Traversable">Traversable</a></span> <code class="parameter">$iterator</code></span>
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, <span class="methodparam"><span class="type"><a href="language.types.callable.html" class="type callable">callable</a></span> <code class="parameter">$function</code></span>
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[, <span class="methodparam"><span class="type">array</span> <code class="parameter">$args</code></span>
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] ) : <span class="type">int</span></div>
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<p class="para rdfs-comment">
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循环迭代每个元素时调用某一回调函数。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.iterator-apply-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">iterator</code></dt>
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<dd>
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<p class="para">
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需要循环迭代的类对象。
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</p>
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</dd>
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<dt>
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<code class="parameter">function</code></dt>
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<dd>
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<p class="para">
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迭代到每个元素时的调用的回调函数。
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<span class="simpara">
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为了遍历 <code class="parameter">iterator</code> 这个函数必须返回 <strong><code>TRUE</code></strong>。
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</span>
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</p></blockquote>
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</p>
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</dd>
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<dt>
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<code class="parameter">args</code></dt>
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<dd>
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<p class="para">
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传递到回调函数的参数。
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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.iterator-apply-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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返回已迭代的元素个数。
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.iterator-apply-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-4716">
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<p><strong>Example #1 <span class="function"><strong>iterator_apply()</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 /></span><span style="color: #007700">function </span><span style="color: #0000BB">print_caps</span><span style="color: #007700">(</span><span style="color: #0000BB">Iterator $iterator</span><span style="color: #007700">) {<br /> echo </span><span style="color: #0000BB">strtoupper</span><span style="color: #007700">(</span><span style="color: #0000BB">$iterator</span><span style="color: #007700">-></span><span style="color: #0000BB">current</span><span style="color: #007700">()) . </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /> return </span><span style="color: #0000BB">TRUE</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #0000BB">$it </span><span style="color: #007700">= new </span><span style="color: #0000BB">ArrayIterator</span><span style="color: #007700">(array(</span><span style="color: #DD0000">"Apples"</span><span style="color: #007700">, </span><span style="color: #DD0000">"Bananas"</span><span style="color: #007700">, </span><span style="color: #DD0000">"Cherries"</span><span style="color: #007700">));<br /></span><span style="color: #0000BB">iterator_apply</span><span style="color: #007700">(</span><span style="color: #0000BB">$it</span><span style="color: #007700">, </span><span style="color: #DD0000">"print_caps"</span><span style="color: #007700">, array(</span><span style="color: #0000BB">$it</span><span style="color: #007700">));<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 class="example-contents"><p>以上例程会输出：</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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APPLES
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BANANAS
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CHERRIES
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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.iterator-apply-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="array_walk.html" class="function" rel="rdfs-seeAlso">array_walk()</a> - 使用用户自定义函数对数组中的每个元素做回调处理</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> |