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git-svn-id: https://svn.php.net/repository/phpdoc/zh/trunk@328405 c90b9560-bf6c-de11-be94-00142212c4b1
99 lines
2.1 KiB
XML
99 lines
2.1 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<!-- EN-Revision: fa6e196973e45c0013c0801e01697757f4b98426 Maintainer: daijie Status: ready -->
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<!-- Reviewed: no -->
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<chapter xml:id="reflection.extending" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
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<title>扩展</title>
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<para>
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如果你想创建内建类的专门版本（比如说，在创建并导出高亮 HTML 时，以易于访问的成员变量来取代方法或使用实用的方法），
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你可以继续并扩展它们。
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</para>
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<example>
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<title>扩展内置的类</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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/**
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* My Reflection_Method class
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*/
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class My_Reflection_Method extends ReflectionMethod
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{
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public $visibility = array();
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public function __construct($o, $m)
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{
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parent::__construct($o, $m);
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$this->visibility = Reflection::getModifierNames($this->getModifiers());
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}
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}
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/**
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* Demo class #1
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*
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*/
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class T {
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protected function x() {}
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}
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/**
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* Demo class #2
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*
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*/
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class U extends T {
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function x() {}
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}
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// 输出信息
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var_dump(new My_Reflection_Method('U', 'x'));
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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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object(My_Reflection_Method)#1 (3) {
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["visibility"]=>
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array(1) {
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[0]=>
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string(6) "public"
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}
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["name"]=>
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string(1) "x"
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["class"]=>
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string(1) "U"
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}
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]]>
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</screen>
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</example>
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<caution>
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<para>
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如果你重写了构造函数，记住在写任何插入的代码之前要先调用父类的构造函数。
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不这么做将会导致以下的结果：
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<literal>Fatal error: Internal error: Failed to retrieve the reflection object</literal>
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</para>
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</caution>
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</chapter>
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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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