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is-subclass-of.xml
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is-subclass-of.xml
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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<!-- EN-Revision: c44475e1fafcbee203ed4935a6d5d7a01379fcdc Maintainer: HonestQiao Status: ready -->
<!-- CREDITS: mowangjuanzi -->
<refentry xml:id="function.is-subclass-of" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>is_subclass_of</refname>
<refpurpose>检查对象是否继承或者实现(implement)此类</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>bool</type><methodname>is_subclass_of</methodname>
<methodparam><type>mixed</type><parameter>object_or_class</parameter></methodparam>
<methodparam><type>string</type><parameter>class</parameter></methodparam>
<methodparam choice="opt"><type>bool</type><parameter>allow_string</parameter><initializer>&true;</initializer></methodparam>
</methodsynopsis>
<para>
检查指定的 <parameter>object_or_class</parameter> 是否继承或者实现(implement) <parameter>class</parameter>。
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>object_or_class</parameter></term>
<listitem>
<para>
类名或者对象实例。如果类不存在,也不会报错。
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>class</parameter></term>
<listitem>
<para>
类名
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>allow_string</parameter></term>
<listitem>
<para>
如果此参数设置为 false,将不允许将字符串类名传递给
<parameter>object_or_class</parameter>。如果类不存在,这也可以防止调用自动加载器。
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
如果对象 <parameter>object_or_class</parameter> 属于 <parameter>class</parameter> 的子类,则返回
&true;,否则返回 &false;。
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>is_subclass_of</function> 示例</title>
<programlisting role="php">
<![CDATA[
<?php
// 定义类
class WidgetFactory
{
var $oink = 'moo';
}
// 定义子类
class WidgetFactory_Child extends WidgetFactory
{
var $oink = 'oink';
}
// 创建新对象
$WF = new WidgetFactory();
$WFC = new WidgetFactory_Child();
if (is_subclass_of($WFC, 'WidgetFactory')) {
echo "yes, \$WFC is a subclass of WidgetFactory\n";
} else {
echo "no, \$WFC is not a subclass of WidgetFactory\n";
}
if (is_subclass_of($WF, 'WidgetFactory')) {
echo "yes, \$WF is a subclass of WidgetFactory\n";
} else {
echo "no, \$WF is not a subclass of WidgetFactory\n";
}
if (is_subclass_of('WidgetFactory_Child', 'WidgetFactory')) {
echo "yes, WidgetFactory_Child is a subclass of WidgetFactory\n";
} else {
echo "no, WidgetFactory_Child is not a subclass of WidgetFactory\n";
}
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
yes, $WFC is a subclass of WidgetFactory
no, $WF is not a subclass of WidgetFactory
yes, WidgetFactory_Child is a subclass of WidgetFactory
]]>
</screen>
</example>
</para>
<para>
<example>
<title><function>is_subclass_of</function> 使用接口示例</title>
<programlisting role="php">
<![CDATA[
<?php
// 定义接口
interface MyInterface
{
public function MyFunction();
}
// 定义实现了接口的类
class MyClass implements MyInterface
{
public function MyFunction()
{
return "MyClass Implements MyInterface!";
}
}
// 实例化对象
$my_object = new MyClass;
// 自 5.3.7 起可用
// 使用类的对象实例进行检查
if (is_subclass_of($my_object, 'MyInterface')) {
echo "Yes, \$my_object is a subclass of MyInterface\n";
} else {
echo "No, \$my_object is not a subclass of MyInterface\n";
}
// 使用字符串类名进行检查
if (is_subclass_of('MyClass', 'MyInterface')) {
echo "Yes, MyClass is a subclass of MyInterface\n";
} else {
echo "No, MyClass is not a subclass of MyInterface\n";
}
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
Yes, $my_object is a subclass of MyInterface
Yes, MyClass is a subclass of MyInterface
]]>
</screen>
</example>
</para>
</refsect1>
<refsect1 role="notes">
&reftitle.notes;
¬e.uses-autoload;
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>get_class</function></member>
<member><function>get_parent_class</function></member>
<member><function>is_a</function></member>
<member><function>class_parents</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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sgml-shorttag:t
sgml-minimize-attributes:nil
sgml-always-quote-attributes:t
sgml-indent-step:1
sgml-indent-data:t
indent-tabs-mode:nil
sgml-parent-document:nil
sgml-default-dtd-file:"~/.phpdoc/manual.ced"
sgml-exposed-tags:nil
sgml-local-catalogs:nil
sgml-local-ecat-files:nil
End:
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vim: et tw=78 syn=sgml
vi: ts=1 sw=1
-->