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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<!-- EN-Revision: e50e79746736dbdfbabe9bd3566793b3ddf38f58 Maintainer: Luffy Status: ready -->
<refentry xml:id="reflectionreference.fromarrayelement" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
<refnamediv>
<refname>ReflectionReference::fromArrayElement</refname>
<refpurpose>从数组元素创建一个 ReflectionReference</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis role="ReflectionReference">
<modifier>public</modifier> <modifier>static</modifier> <type class="union"><type>ReflectionReference</type><type>null</type></type><methodname>ReflectionReference::fromArrayElement</methodname>
<methodparam><type>array</type><parameter>array</parameter></methodparam>
<methodparam><type class="union"><type>int</type><type>string</type></type><parameter>key</parameter></methodparam>
</methodsynopsis>
<para>
从数组元素创建一个 <classname>ReflectionReference</classname>
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<variablelist>
<varlistentry>
<term><parameter>array</parameter></term>
<listitem>
<para>
包含潜在引用的 &array;
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>key</parameter></term>
<listitem>
<para>
一个 &integer; 或者 &string; 类型的 key。
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
如果 <literal>$array[$key]</literal> 是引用,返回 <classname>ReflectionReference</classname>
实例,否则返回 &null;
</para>
</refsect1>
<refsect1 role="errors">
&reftitle.errors;
<para>
如果 <parameter>array</parameter> 不是一个 &array;,或者 <parameter>key</parameter>
不是 &integer; 或者 &string; 类型,会抛出 <classname>TypeError</classname>
如果 <literal>$array[$key]</literal> 不存在,
会抛出 <classname>ReflectionException</classname>
</para>
</refsect1>
</refentry>
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