mirror of
https://github.com/php/doc-zh.git
synced 2026-03-23 22:52:08 +01:00
132 lines
3.3 KiB
XML
Executable File
132 lines
3.3 KiB
XML
Executable File
<?xml version="1.0" encoding="utf-8"?>
|
||
<!-- $Revision$ -->
|
||
<!-- EN-Revision: a4fb7f59310a598b8cb8ca1daa47e557f32ae66e Maintainer: HonestQiao Status: ready -->
|
||
<!-- CREDITS: mowangjuanzi -->
|
||
<refentry xml:id="function.property-exists" xmlns="http://docbook.org/ns/docbook">
|
||
<refnamediv>
|
||
<refname>property_exists</refname>
|
||
<refpurpose>
|
||
检查对象或类是否具有该属性
|
||
</refpurpose>
|
||
</refnamediv>
|
||
<refsect1 role="description">
|
||
&reftitle.description;
|
||
<methodsynopsis>
|
||
<type>bool</type><methodname>property_exists</methodname>
|
||
<methodparam><type class="union"><type>object</type><type>string</type></type><parameter>object_or_class</parameter></methodparam>
|
||
<methodparam><type>string</type><parameter>property</parameter></methodparam>
|
||
</methodsynopsis>
|
||
<para>
|
||
本函数检查给出的 <parameter>property</parameter> 是否存在于指定的类中。
|
||
</para>
|
||
<note>
|
||
<para>
|
||
跟 <function>isset</function> 的区别是即使属性的值为 &null;，<function>property_exists</function> 也会返回 &true;。
|
||
</para>
|
||
</note>
|
||
</refsect1>
|
||
<refsect1 role="parameters">
|
||
&reftitle.parameters;
|
||
<para>
|
||
<variablelist>
|
||
<varlistentry>
|
||
<term><parameter>object_or_class</parameter></term>
|
||
<listitem>
|
||
<para>
|
||
需要检查的类名或者类的对象
|
||
</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
<varlistentry>
|
||
<term><parameter>property</parameter></term>
|
||
<listitem>
|
||
<para>
|
||
属性的名称
|
||
</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
</variablelist>
|
||
</para>
|
||
</refsect1>
|
||
<refsect1 role="returnvalues">
|
||
&reftitle.returnvalues;
|
||
<para>
|
||
如果属性存在则返回 &true;，不存在则返回 &false;。
|
||
</para>
|
||
</refsect1>
|
||
|
||
<refsect1 role="examples">
|
||
&reftitle.examples;
|
||
<para>
|
||
<example>
|
||
<title><function>property_exists</function> 示例</title>
|
||
<programlisting role="php">
|
||
<![CDATA[
|
||
<?php
|
||
|
||
class myClass {
|
||
public $mine;
|
||
private $xpto;
|
||
static protected $test;
|
||
|
||
static function test() {
|
||
var_dump(property_exists('myClass', 'xpto')); //true
|
||
}
|
||
}
|
||
|
||
var_dump(property_exists('myClass', 'mine')); //true
|
||
var_dump(property_exists(new myClass, 'mine')); //true
|
||
var_dump(property_exists('myClass', 'xpto')); //true
|
||
var_dump(property_exists('myClass', 'bar')); //false
|
||
var_dump(property_exists('myClass', 'test')); //true
|
||
myClass::test();
|
||
|
||
?>
|
||
]]>
|
||
</programlisting>
|
||
</example>
|
||
</para>
|
||
</refsect1>
|
||
|
||
<refsect1 role="notes">
|
||
&reftitle.notes;
|
||
¬e.uses-autoload;
|
||
<note>
|
||
<para>
|
||
<function>property_exists</function> 函数不能检查通过
|
||
<link linkend="language.oop5.overloading.members"><literal>__get</literal></link>
|
||
魔术方法访问的属性。
|
||
</para>
|
||
</note>
|
||
</refsect1>
|
||
|
||
<refsect1 role="seealso">
|
||
&reftitle.seealso;
|
||
<para>
|
||
<simplelist>
|
||
<member><function>method_exists</function></member>
|
||
</simplelist>
|
||
</para>
|
||
</refsect1>
|
||
</refentry>
|
||
<!-- Keep this comment at the end of the file
|
||
Local variables:
|
||
mode: sgml
|
||
sgml-omittag:t
|
||
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:
|
||
vim600: syn=xml fen fdm=syntax fdl=2 si
|
||
vim: et tw=78 syn=sgml
|
||
vi: ts=1 sw=1
|
||
-->
|