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reserved.xml
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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<!-- EN-Revision: 010542d1dcb9b1d5cd397a77ed580e50de25aca7 Maintainer: HonestQiao Status: ready -->
<!-- CREDITS: dallas, Luffy, mowangjuanzi -->
<appendix xml:id="reserved" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
<title>保留字列表</title>
<para>
以下是 PHP 中预定义标识符的列表。没有列在下面的标识符可以在脚本中作为自定义标识符使用。这些列表包括关键字和预定义变量、常量和类名。这些列表可能有遗漏,它是不完整的。
</para>
<sect1 xml:id="reserved.keywords">
<title>关键词列表</title>
<simpara>
这些词语在 PHP
中有着特殊的意义。它们中有些像是函数,有些像是常量,但是它们不是真的,它们只是语言结构的一部分。不能使用它们的任何一个作为常量、类名或函数名。但是它们可以被用作类的属性、常量以及类的方法名,或者接口名和
traits 名,除了 <literal>class</literal> 不能被用作常量名。
</simpara>
<table>
<title>PHP 关键词</title>
<tgroup cols="5">
<tbody>
<row>
<entry>
<function>__halt_compiler</function>
</entry>
<entry>
<link linkend="language.oop5.abstract">abstract</link>
</entry>
<entry>
<link linkend="language.operators.logical">and</link>
</entry>
<entry>
<function>array</function>
</entry>
<entry>
<link linkend="control-structures.foreach">as</link>
</entry>
</row>
<row>
<entry>
<link linkend="control-structures.break">break</link>
</entry>
<entry>
<link linkend="language.types.callable">callable</link>
</entry>
<entry>
<link linkend="control-structures.switch">case</link>
</entry>
<entry>
<link linkend="language.exceptions">catch</link>
</entry>
<entry>
<link linkend="language.oop5.basic.class">class</link>
</entry>
</row>
<row>
<entry>
<link linkend="language.oop5.cloning">clone</link>
</entry>
<entry>
<link linkend="language.oop5.constants">const</link>
</entry>
<entry>
<link linkend="control-structures.continue">continue</link>
</entry>
<entry>
<link linkend="control-structures.declare">declare</link>
</entry>
<entry>
<link linkend="control-structures.switch">default</link>
</entry>
</row>
<row>
<entry>
<function>die</function>
</entry>
<entry>
<link linkend="control-structures.do.while">do</link>
</entry>
<entry>
<function>echo</function>
</entry>
<entry>
<link linkend="control-structures.else">else</link>
</entry>
<entry>
<link linkend="control-structures.elseif">elseif</link>
</entry>
</row>
<row>
<entry>
<function>empty</function>
</entry>
<entry>
<link linkend="control-structures.declare">enddeclare</link>
</entry>
<entry>
<link linkend="control-structures.alternative-syntax">endfor</link>
</entry>
<entry>
<link linkend="control-structures.alternative-syntax">endforeach</link>
</entry>
<entry>
<link linkend="control-structures.alternative-syntax">endif</link>
</entry>
</row>
<row>
<entry>
<link linkend="control-structures.alternative-syntax">endswitch</link>
</entry>
<entry>
<link linkend="control-structures.alternative-syntax">endwhile</link>
</entry>
<entry>
<function>eval</function>
</entry>
<entry>
<function>exit</function>
</entry>
<entry>
<link linkend="language.oop5.basic.extends">extends</link>
</entry>
</row>
<row>
<entry>
<link linkend="language.oop5.final">final</link>
</entry>
<entry>
<link linkend="language.exceptions">finally</link>
</entry>
<entry>
<link linkend="functions.arrow">fn</link>(从 PHP 7.4 开始)
</entry>
<entry>
<link linkend="control-structures.for">for</link>
</entry>
<entry>
&foreach;
</entry>
</row>
<row>
<entry>
<link linkend="functions.user-defined">function</link>
</entry>
<entry>
<link linkend="language.variables.scope">global</link>
</entry>
<entry>
<link linkend="control-structures.goto">goto</link>
</entry>
<entry>
<link linkend="control-structures.if">if</link>
</entry>
<entry>
<link linkend="language.oop5.interfaces">implements</link>
</entry>
</row>
<row>
<entry>
<function>include</function>
</entry>
<entry>
<function>include_once</function>
</entry>
<entry>
<link linkend="language.operators.type">instanceof</link>
</entry>
<entry>
<link linkend="language.oop5.traits.conflict">insteadof</link>
</entry>
<entry>
<link linkend="language.oop5.interfaces">interface</link>
</entry>
</row>
<row>
<entry>
<function>isset</function>
</entry>
<entry>
<function>list</function>
</entry>
<entry>
&match;(从 PHP 8.0 开始)
</entry>
<entry>
<link linkend="language.namespaces">namespace</link>
</entry>
<entry>
<link linkend="language.oop5.basic.new">new</link>
</entry>
</row>
<row>
<entry>
<link linkend="language.operators.logical">or</link>
</entry>
<entry>
<function>print</function>
</entry>
<entry>
<link linkend="language.oop5.visibility">private</link>
</entry>
<entry>
<link linkend="language.oop5.visibility">protected</link>
</entry>
<entry>
<link linkend="language.oop5.visibility">public</link>
</entry>
</row>
<row>
<entry>
<link linkend="language.oop5.properties.readonly-properties">readonly</link>(自 PHP 8.1.0 起)*
</entry>
<entry>
<function>require</function>
</entry>
<entry>
<function>require_once</function>
</entry>
<entry>
<function>return</function>
</entry>
<entry>
<link linkend="language.variables.scope">static</link>
</entry>
</row>
<row>
<entry>
<link linkend="control-structures.switch">switch</link>
</entry>
<entry>
<link linkend="language.exceptions">throw</link>
</entry>
<entry>
<link linkend="language.oop5.traits">trait</link>
</entry>
<entry>
<link linkend="language.exceptions">try</link>
</entry>
<entry>
<function>unset</function>
</entry>
</row>
<row>
<entry>
<link linkend="language.namespaces">use</link>
</entry>
<entry>
<link linkend="language.oop5.properties">var</link>
</entry>
<entry>
<link linkend="control-structures.while">while</link>
</entry>
<entry>
<link linkend="language.operators.logical">xor</link>
</entry>
<entry>
<link linkend="language.generators">yield</link>
</entry>
</row>
<row>
<entry>
<link linkend="control-structures.yield.from">yield from</link>
</entry>
<entry></entry>
<entry></entry>
<entry></entry>
<entry></entry>
</row>
</tbody>
</tgroup>
</table>
<simpara>
* <literal>readonly</literal> 可用作函数名。
</simpara>
<table>
<title>编译时常量</title>
<tgroup cols="5">
<tbody>
<row>
<entry>
<link linkend="language.constants.predefined">__CLASS__</link>
</entry>
<entry>
<link linkend="language.constants.predefined">__DIR__</link>
</entry>
<entry>
<link linkend="language.constants.predefined">__FILE__</link>
</entry>
<entry>
<link linkend="language.constants.predefined">__FUNCTION__</link>
</entry>
<entry>
<link linkend="language.constants.predefined">__LINE__</link>
</entry>
<entry>
<link linkend="language.constants.predefined">__METHOD__</link>
</entry>
</row>
<row>
<entry>
<link linkend="language.namespaces.nsconstants">__NAMESPACE__</link>
</entry>
<entry>
<link linkend="language.constants.predefined">__TRAIT__</link>
</entry>
<entry>
</entry>
<entry>
</entry>
<entry>
</entry>
<entry>
</entry>
</row>
</tbody>
</tgroup>
</table>
</sect1>
<sect1 xml:id="reserved.classes">
<title>预定义类</title>
<para>
本节列出标准的预定义类。各种扩展库定义了其它类,其说明在各自的参考文档中。
</para>
<sect2 xml:id="reserved.classes.standard">
<title>标准类</title>
<simpara>
这些类由一些内建在 PHP 中的标准函数定义。
</simpara>
<variablelist>
<varlistentry>
<term><classname>Directory</classname></term>
<listitem>
<simpara>
由 <function>dir</function> 创建。
</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><classname>stdClass</classname></term>
<listitem>
<simpara>
使用<link linkend="language.types.object.casting">类型转换为对象</link>或者各种标准函数创建的通用空类。
</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><classname>__PHP_Incomplete_Class</classname></term>
<listitem>
<simpara>
可能由 <function>unserialize</function> 创建。
</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><classname>Exception</classname></term>
<listitem>
<simpara>
</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><classname>ErrorException</classname></term>
<listitem>
<simpara>
</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><classname>php_user_filter</classname></term>
<listitem>
<simpara>
</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><classname>Closure</classname></term>
<listitem>
<simpara>
预定义的 final 类 <classname>Closure</classname>,它可以用于实现
<link
linkend="functions.anonymous">匿名函数</link>。
</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><classname>Generator</classname></term>
<listitem>
<simpara>
预定义的 final 类 <classname>Generator</classname>,它可以用于实现
<link linkend="language.generators">生成器</link>。
</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><classname>ArithmeticError</classname></term>
<listitem>
<simpara>
</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><classname>AssertionError</classname></term>
<listitem>
<simpara>
</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><classname>DivisionByZeroError</classname></term>
<listitem>
<simpara>
</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><classname>Error</classname></term>
<listitem>
<simpara>
</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><classname>Throwable</classname></term>
<listitem>
<simpara>
</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><classname>ParseError</classname></term>
<listitem>
<simpara>
</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><classname>TypeError</classname></term>
<listitem>
<simpara>
</simpara>
</listitem>
</varlistentry>
</variablelist>
</sect2>
<sect2 xml:id="reserved.classes.special">
<title>特殊的类</title>
<simpara>
以下这些标识符由于它们有特殊的用处,因此不可作为类名
</simpara>
<variablelist>
<varlistentry>
<term><classname>self</classname></term>
<listitem>
<simpara>
<link linkend="language.oop5.paamayim-nekudotayim">当前类</link>。
</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><classname>static</classname></term>
<listitem>
<simpara>
<link linkend="language.oop5.late-static-bindings">运行时的当前类</link>。
</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><classname>parent</classname></term>
<listitem>
<simpara>
<link linkend="language.oop5.paamayim-nekudotayim">父级类</link>。
</simpara>
</listitem>
</varlistentry>
</variablelist>
</sect2>
</sect1>
&appendices.reserved.constants;
<sect1 xml:id="reserved.other-reserved-words">
<title>其他保留字列表</title>
<simpara>
以下关键字不可被用于类名、接口名和trait名,在 PHP 8.0
之前,它们被禁止用于命名空间。
</simpara>
<para>
<table>
<title>保留字</title>
<tgroup cols="4">
<tbody>
<row>
<entry>
int
</entry>
<entry>
float
</entry>
<entry>
bool
</entry>
<entry>
string
</entry>
</row>
<row>
<entry>
true
</entry>
<entry>
false
</entry>
<entry>
null
</entry>
<entry>
void(从 PHP 7.1 开始)
</entry>
</row>
<row>
<entry>
iterable(从 PHP 7.1 开始)
</entry>
<entry>
object(从 PHP 7.2 开始)
</entry>
<entry>
mixed(从 PHP 8.0 开始)
</entry>
<entry>
never(从 PHP 8.1 开始)
</entry>
</row>
</tbody>
</tgroup>
</table>
</para>
<para>
以下关键词已经被建议保留。尽管你仍然可以将它们用于类名、接口名和 trait
名,但是考虑到在将来的PHP版本中可能会使用,因此非常不推荐去使用它们。
</para>
<para>
<table>
<title>Soft reserved words</title>
<tgroup cols="4">
<tbody>
<row>
<entry>
enum
</entry>
<entry>
resource
</entry>
<entry>
numeric
</entry>
<entry>
</entry>
</row>
</tbody>
</tgroup>
</table>
</para>
</sect1>
</appendix>
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