Question

php中，用try/catch捕获了异常，为什么还会有警告？有没有办法去掉呢？

代码：
try
{
preg_match_all($pattern,$string,$all);
}
catch (Exception $ex)
{
echo $ex->getTraceAsString();
}

错误提示：
Warning: preg_match_all() [function.preg-match-all]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for '8.0/no DST' instead in F:\php\doom\newfile.php on line 52

Warning: preg_match_all() [function.preg-match-all]: Empty regular expression in F:\php\doom\newfile.php on line 52
能否说明下“@抑制错误”的具体语法呢

Answer 1

因为它既抛出异常又触发错误, 你需要@抑制错误, try并不负责屏蔽错误触发, 只负责接收抛出的异常

Answer 2

php 不提供内置抛出异常，如果用try catch 必须自定义异常，并且手动throws才可以！

Answer 3

试试把error_reporting(0);这句放在php文件的开头
至于@
则是在函数前加 如
while ($row = @mysql_fetch_assoc($qrt))

Answer 4

我也想来看看结果到底是咋样的。来学习了。