restore_exception_handler ()函数恢复PHP自身的异常处理。会清除set_exception_handler中用户自定义的函数处理方式

例子：

function handleException(Exception $e)
{ 
    do{
        echo "<b>错误信息</b>：" . $e->getMessage() . "</br>";
        echo "<b>错误码</b>：" . $e->getCode() . "</br>";
        echo "<b>错误文件</b>：" . $e->getFile() . "</br>";
        echo "<b>错误行数</b>：" . $e->getLine() . "</br>";
        echo "<b>错误行数</b>：" . $e->getPrevious() . "</br>";
        echo "<b>异常追踪信息</b>：</br>";
        echo "</pre>" . print_r($e->getTrace(), true) . "</pre></br>";
        echo "***********</br>";
    } while($e = $e->getPrevious());
}

set_exception_handler("handleException");

function test($name) {
    throw new Exception("Test exception", 1000);
}

restore_exception_handler();
test("codyi");

结果：

Fatal error: Uncaught exception 'Exception' with message 'Test exception' in /Users/liguosong/work/php/Testing/test.php on line 21 Exception: Test exception in /Users/liguosong/work/php/Testing/test.php on line 21 Call Stack: 0.0002 251616 1. {main}() /Users/liguosong/work/php/Testing/test.php:0 0.0003 252240 2. test(???) /Users/liguosong/work/php/Testing/test.php:25