PHP error: Exception thrown without a stack frame in Unknown on line 0［Reprinted］，thrownstack_PHP tutorial

PHP error: Exception thrown without a stack frame in Unknown on line 0 [Reprinted], thrownstack

From: NetEase Blog

As far as I know, In two cases, PHP will report the error Exception thrown without a stack frame in Unknown on line 0:

1) Exception capture uses the set_exception_handler guide, and another Exception is executed inside the Exception

As shown in the following code , this problem will occur:

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

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

Print $undefined in the exception_handler function; This line itself will throw an exception, and he calls the exception_handler function of set_exception_handler, creating an infinite loop.

Solution: Do not execute another Exception inside an Exception

The above problem can be solved using try...catch. For example, the exception_handler can be changed to the following:

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

2) Throw an exception in the destructor

Refer to this bug: http://bugs.php.net/bug.php?id=33598

The following code will report this error:

<span>class</span><span> test {
    </span><span>function</span><span> __construct() {
        </span><span>echo</span> "Construct\n"<span>;
    }

    </span><span>function</span><span> greet() {
        </span><span>echo</span> "Hello World\n"<span>;
    } 

    </span><span>function</span><span> __destruct() {
        </span><span>echo</span> "Destruct\n"<span>;
        </span><span>throw</span> <span>new</span> <span>Exception</span>( 'test'<span> );
    }
}

</span><span>$test</span> = <span>new</span><span> test();
</span><span>$test</span>->greet();

Current solution:

1. Do not throw exceptions in the destructor.

2. Since the destructor is executed when exiting, you must manually unset this class and catch the exception.

For example, in the above example, add a line of unset($test) at the end, then the program will report throw new Exception( 'test' ); There is an error in this line, and then catch this exception.

The above two situations will occur in PHP 5.2.11 version. As for the reason, I think PHP may handle it this way. PHP bug 33598 was reported in 2005. The bug Status is Closed, indicating that the official does not think this is the case. A bug, or a bug not handled properly.

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