mirror of
https://github.com/php/doc-zh.git
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177 lines
4.3 KiB
XML
177 lines
4.3 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<!-- EN-Revision: 9eb4a46bba05da229be4c8f7a3cb64702e1a2f95 Maintainer: HonestQiao Status: ready -->
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<!-- CREDITS: Luffy, mowangjuanzi -->
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<reference xml:id="class.iterator" role="class" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xi="http://www.w3.org/2001/XInclude">
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<title>Iterator（迭代器）接口</title>
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<titleabbrev>Iterator</titleabbrev>
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<partintro>
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<!-- {{{ Iterator intro -->
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<section xml:id="iterator.intro">
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&reftitle.intro;
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<para>
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可在内部迭代自己的外部迭代器或类的接口。
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</para>
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</section>
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<!-- }}} -->
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<section xml:id="iterator.synopsis">
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&reftitle.interfacesynopsis;
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<!-- {{{ Synopsis -->
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<classsynopsis class="interface">
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<oointerface>
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<interfacename>Iterator</interfacename>
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</oointerface>
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<oointerface>
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<modifier>extends</modifier>
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<interfacename>Traversable</interfacename>
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</oointerface>
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<classsynopsisinfo role="comment">&Methods;</classsynopsisinfo>
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<xi:include xpointer="xmlns(db=http://docbook.org/ns/docbook) xpointer(id('class.iterator')/db:refentry/db:refsect1[@role='description']/descendant::db:methodsynopsis[@role='Iterator'])">
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<xi:fallback/>
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</xi:include>
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</classsynopsis>
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<!-- }}} -->
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</section>
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<section xml:id="iterator.iterators">
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<title>预定义迭代器</title>
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<para>
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PHP 已经提供了一些用于日常任务的迭代器。
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详细列表参见 <link linkend="spl.iterators">SPL 迭代器</link>。
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</para>
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</section>
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<section xml:id="iterator.examples">
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&reftitle.examples;
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<example xml:id="iterator.example.basic"><!-- {{{ -->
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<title>基本用法</title>
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<para>
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这个例子展示了使用 &foreach; 时，迭代器方法的调用顺序。
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</para>
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<programlisting role="php">
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<![CDATA[
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<?php
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class myIterator implements Iterator {
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private $position = 0;
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private $array = array(
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"firstelement",
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"secondelement",
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"lastelement",
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);
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public function __construct() {
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$this->position = 0;
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}
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public function rewind(): void {
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var_dump(__METHOD__);
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$this->position = 0;
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}
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#[\ReturnTypeWillChange]
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public function current() {
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var_dump(__METHOD__);
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return $this->array[$this->position];
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}
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#[\ReturnTypeWillChange]
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public function key() {
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var_dump(__METHOD__);
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return $this->position;
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}
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public function next(): void {
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var_dump(__METHOD__);
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++$this->position;
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}
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public function valid(): bool {
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var_dump(__METHOD__);
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return isset($this->array[$this->position]);
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}
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}
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$it = new myIterator;
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foreach($it as $key => $value) {
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var_dump($key, $value);
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echo "\n";
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}
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?>
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]]>
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</programlisting>
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&example.outputs.similar;
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<screen>
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<![CDATA[
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string(18) "myIterator::rewind"
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string(17) "myIterator::valid"
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string(19) "myIterator::current"
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string(15) "myIterator::key"
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int(0)
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string(12) "firstelement"
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string(16) "myIterator::next"
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string(17) "myIterator::valid"
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string(19) "myIterator::current"
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string(15) "myIterator::key"
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int(1)
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string(13) "secondelement"
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string(16) "myIterator::next"
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string(17) "myIterator::valid"
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string(19) "myIterator::current"
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string(15) "myIterator::key"
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int(2)
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string(11) "lastelement"
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string(16) "myIterator::next"
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string(17) "myIterator::valid"
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]]>
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</screen>
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</example><!-- }}} -->
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</section>
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<section xml:id="iterator.seealso">
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&reftitle.seealso;
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<para>参见 <link linkend="language.oop5.iterations">遍历对象</link>。</para>
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</section>
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</partintro>
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&language.predefined.iterator.current;
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&language.predefined.iterator.key;
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&language.predefined.iterator.next;
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&language.predefined.iterator.rewind;
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&language.predefined.iterator.valid;
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</reference>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"~/.phpdoc/manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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