为什么我的 PHP 异常不起作用？

Question

我真的是 PHP 或任何语言中的异常的新手。如果用户输入无效的文本时区（在本例中为“xxxxxxxxxx”），我试图捕获异常。我的测试用例肯定是无效的，因为触发了异常，而不是应该智能处理它的 catch 逻辑。基本上，如果输入了无效的时区字符串，我希望它使用有效的时区字符串。

echo $tz_text . '~' . $username . '<br />';
try
{
    $tz = new \DateTimeZone($tz_text);
}
catch (Exception $e)
{
    // Handles the issue of a timezone not being correct, see http://php.net/manual/en/timezones.php
    if ($this->config['phpbbservices_digests_enable_log'])
    {
        $this->phpbb_log->add('admin', $this->user->data['user_id'], $this->user->ip, 'LOG_CONFIG_DIGESTS_TIMEZONE_ERROR', array($tz_text, $username, $this->config['board_timezone']));
    }
    $tz = new \DateTimeZone($this->config['board_timezone']);
}

我回来了：

xxxxxxxxxx~马克·D·哈米尔

致命错误：在 /Applications/XAMPP/xamppfiles/apps/phpbb/htdocs/ext/phpbbservices/digests/cron 中带有消息“DateTimeZone::__construct(): Unknown or bad timezone (xxxxxxxxxx)”的未捕获异常“Exception” /task/digests.php:1938 堆栈跟踪：#0 /Applications/XAMPP/xamppfiles/apps/phpbb/htdocs/ext/phpbbservices/digests/cron/task/digests.php(1938): DateTimeZone->__construct('xxxxxxxxxx ') #1 /Applications/XAMPP/xamppfiles/apps/phpbb/htdocs/ext/phpbbservices/digests/cron/task/digests.php(514): phpbbservices\digests\cron\task\digests->make_tz_offset('xxxxxxxxxx' , 'Mark D Hamill') #2 /Applications/XAMPP/xamppfiles/apps/phpbb/htdocs/ext/phpbbservices/digests/cron/task/digests.php(157): phpbbservices\digests\cron\task\digests-> mail_digests(1458353337, 0) #3 /Applications/XAMPP/xamppfiles/apps/phpbb/htdocs/ext/phpbbservices/digests/acp/main_module.php(1427): phpbbservices\digests\cron\task\digests->run() #4 /Applications/XAMPP/xamppfiles/apps/phpbb/htdocs/includes/functions_module.php(674)： phpbbservices\digests\acp\main_module-> 在 /Applications/XAMPP/xamppfiles/apps/phpbb/htdocs/ext/phpbbservices/digests/cron/task/digests.php 1938 行

第 1938 行是应该捕获错误的地方：

    $tz = new \DateTimeZone($tz_text);

Answer 1

看起来上面的代码 sn-p 在命名空间内。考虑以下代码 -

<?php

namespace Foo/Bar;

try {
   ...
} catch (Exception $e) { // This is trying to catch Foo/Bar/Exception
   ...
}

通过将代码更改为类似这样来明确指定它的解决方案 -

try {
    ....
} catch (\Exception $e) {
    ....
}

进一步阅读 - http://php.net/manual/en/language.namespaces.php http://php.net/manual/en/language.namespaces.basics.php

拉胡尔