PHP错误: Exception thrown without a stack frame in Unknown on line 0[转载]

来自:网易博客

就目前我的了解,在两种情况下,PHP会报 Exception thrown without a stack frame in Unknown on line 0这种错误:

1)异常捕捉用了set_exception_handler导向,Exception里面执行另一个Exception

如下面这段代码,就会出现这种问题:

http://de.php.net/manual/de/function.set-exception-handler.php#88082

function error_handler($code, $message, $file, $line)
{
    if (0 == error_reporting())
        return;

    throw new ErrorException($message, 0, $code, $file, $line);
}
function exception_handler($e)
{
    // ... normal exception stuff goes here
    print $undefined; // This is the underlying problem
}
set_error_handler("error_handler");
set_exception_handler("exception_handler");
throw new Exception("Just invoking the exception handler");

exception_handler函数内print $undefined;这行本身会抛出一个异常,而他又去调用set_exception_handler的exception_handler函数,死循环了。

解决办法:不要在一个Exception里面执行另一个Exception

上面的问题可以用try ... catch的方式,如exception_handler改成下面这样:

function exception_handler($e)
{
    try
    {
        // ... normal exception stuff goes here
        print $undefined; // This is the underlying problem
    }
    catch (Exception $e)
    {
        print get_class($e)." thrown within the exception handler. Message: ".$e->getMessage()." on line ".$e->getLine();
    }
}

2) 在析构函数抛出异常

参考这个bug:http://bugs.php.net/bug.php?id=33598

下面的代码就会报这个错误:

class test {
    function __construct() {
        echo "Construct\n";
    }

    function greet() {
        echo "Hello World\n";
    } 

    function __destruct() {
        echo "Destruct\n";
        throw new Exception( ‘test‘ );
    }
}

$test = new test();
$test->greet();

目前的解决办法:

1.不要在析构函数中抛出异常.

2.由于析构函数是在退出时执行的,所以要手动unset这种类,并catch该异常。

比如上面的例子,在最后加一行unset($test),这时程序就会报throw new Exception( ‘test‘ ); 这行有错误,再catch这个异常就行了。

上面两种情况在php 5.2.11版本上都会出现,至于原因我认为PHP可能就是这样处理的,php bug 33598 2005年就报上去了,bug Status为Closed,说明官方并不认为这是一个bug,或不当一个bug处理了。

PHP错误: Exception thrown without a stack frame in Unknown on line 0[转载],布布扣,bubuko.com

时间: 2024-10-12 12:21:00

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