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set-exception-handler.xml
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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<!-- EN-Revision: 4a6671fe697ead5b27603b56face01a2c4e7ebe5 Maintainer: daijie Status: ready -->
<!-- CREDITS: mowangjuanzi, Luffy -->
<refentry xml:id="function.set-exception-handler" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>set_exception_handler</refname>
<refpurpose>
设置用户自定义的异常处理函数
</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type class="union"><type>callable</type><type>null</type></type><methodname>set_exception_handler</methodname>
<methodparam><type class="union"><type>callable</type><type>null</type></type><parameter>callback</parameter></methodparam>
</methodsynopsis>
<para>
设置默认的异常处理程序,用于没有用 try/catch 块来捕获的异常。
在 <parameter>callback</parameter> 调用后异常会中止。
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>callback</parameter></term>
<listitem>
<para>
当一个未捕获的异常发生时所调用的函数。该处理函数需要接受一个参数,该参数是抛出的
<classname>Throwable</classname> 对象。<classname>Error</classname>
和 <classname>Exception</classname> 都实现了 <classname>Throwable</classname>
接口。这是处理程序签名:
</para>
<para>
<methodsynopsis>
<type>void</type><methodname><replaceable>handler</replaceable></methodname>
<methodparam><type>Throwable</type><parameter>ex</parameter></methodparam>
</methodsynopsis>
</para>
<para>
也可以传递 &null; 值用于重置异常处理函数为默认值。
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
返回之前定义的异常处理程序,或者在错误时返回
&null;。如果之前没有定义错误处理程序,也会返回 &null;。
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>set_exception_handler</function> 范例</title>
<programlisting role="php">
<![CDATA[
<?php
function exception_handler(Throwable $exception) {
echo "Uncaught exception: " , $exception->getMessage(), "\n";
}
set_exception_handler('exception_handler');
throw new Exception('Uncaught Exception');
echo "Not Executed\n";
?>
]]>
</programlisting>
</example>
</para>
</refsect1>
<refsect1 role="seealso"><!-- {{{ -->
&reftitle.seealso;
<para>
<simplelist>
<member><function>get_exception_handler</function></member>
<member><function>restore_exception_handler</function></member>
<member><function>restore_error_handler</function></member>
<member><function>error_reporting</function></member>
<member><link linkend="language.exceptions">异常</link></member>
</simplelist>
</para>
</refsect1><!-- }}} -->
</refentry>
<!-- Keep this comment at the end of the file
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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
-->