2009/12/11 Hannes Magnusson <hannes.magnusson@xxxxxxxxx>: > On Fri, Dec 11, 2009 at 23:39, Randall Girard <randallgirard@xxxxxxxxxxx> wrote: >> Okay, my mistake. >> >> >> E_USER_WARNING and E_USER_NOTICE are supposed to continue execution, >> correct? > > Correct. > > >> Then I will restate what I previously said. throwing ErrorException from an > > No no. Stop there. Exceptions are *totally* different from E_*. > > >> ERROR_HANDLER(...) is useless iwht E_USER_WARNING and E_USER_NOTICE. Why? >> Because when you throw the exception from the ERROR_HANDLER, presumably it >> may NOT get caught in a try/catch block. Therefor the execution cannot >> continue. > > Exactly. And that is the point. > Why would you be turning E_USER_* into exceptions if you don't want to > bail out of the current scope? > > If you throw an exception from the error handler, what exactly do you > expect to happen? > I gave several reasons for why that simply is impossible, but I am > curious: what exactly are you expecting? > > > >> Therefor, I think that either a check to see if the TRY/CATCH has been >> initiated further up the call stack, or a function to call from within the >> EXCEPTION_HANDLER that will return execution to the previous scope. >> >> >> I don't see how this is difficult to understand. > > So you expect a scripting language to scroll up the entire execution > chain to see if there is a catch() block at all, and if there is no > catch() block, the simply ignore the exception and continue? > If thats your expectations then you are severely misunderstanding the > concept of exceptions. > > > Please do "reply-all". And please do not top-post. > > > -Hannes > > -- > PHP General Mailing List (http://www.php.net/) > To unsubscribe, visit: http://www.php.net/unsub.php > > In support of Hannes, and hopefully providing a simpler script to show what is happening. -----------script------------ <?php function uncaught_exception_handler(Exception $e) { echo 'Exception : ', $e->getMessage(), PHP_EOL; } function uncaught_error_handler($i_ErrNo, $s_Error, $s_File, $i_Line, $a_Context) { echo 'A PHP error has been generated. It will be turned into an exception.', PHP_EOL; switch($i_ErrNo) { case 0 : $s_ErrNo = '@'; return True; break; case 1 : $s_ErrNo = 'E_ERROR'; break; case 2 : $s_ErrNo = 'E_WARNING'; break; case 4 : $s_ErrNo = 'E_PARSE'; break; case 8 : $s_ErrNo = 'E_NOTICE'; break; case 16 : $s_ErrNo = 'E_CORE_ERROR'; break; case 32 : $s_ErrNo = 'E_CORE_WARNING'; break; case 64 : $s_ErrNo = 'E_COMPILE_ERROR'; break; case 128 : $s_ErrNo = 'E_COMPILE_WARNING'; break; case 256 : $s_ErrNo = 'E_USER_ERROR'; break; case 512 : $s_ErrNo = 'E_USER_NOTICE'; break; case 1024 : $s_ErrNo = 'E_USER_NOTICE'; break; case 2048 : $s_ErrNo = 'E_STRICT'; break; case 4096 : $s_ErrNo = 'E_RECOVERABLE_ERROR'; break; case 8192 : $s_ErrNo = 'E_DEPRECATED'; break; case 16384 : $s_ErrNo = 'E_USER_DEPRECATED'; break; } throw new Exception("PHP Error : $s_Error ($s_ErrNo) in $s_File at Line $i_Line", $i_ErrNo); // Never reached as execution continues in the "catch" clause or by a uncaught exception handler. echo 'The exception has been thrown.', PHP_EOL; } set_error_handler('uncaught_error_handler'); set_exception_handler('uncaught_exception_handler'); try { echo 'About to divide by zero inside a try/catch.', PHP_EOL; $a = 1 / 0; } catch(Exception $e) { echo 'Caught : ', $e->getMessage(), PHP_EOL; } echo 'Caught divide by zero E_WARNING.', PHP_EOL, PHP_EOL; echo 'About to divide by zero without a safety net.', PHP_EOL; $b = 1 / 0; // Never reached as we are not catching the execption thrown by the uncaught error handler echo 'Un-caught divide by zero E_WARNING.', PHP_EOL; ?> -----------script------------ outputs ... --------output--------- About to divide by zero inside a try/catch. A PHP error has been generated. It will be turned into an exception. Caught : PHP Error : Division by zero (E_WARNING) in Z:\test_error.php at Line 36 Caught divide by zero E_WARNING. About to divide by zero without a safety net. A PHP error has been generated. It will be turned into an exception. Exception : PHP Error : Division by zero (E_WARNING) in Z:\test_error.php at Line 44 --------output--------- The whole issue is that you are using the (and I can't stress this enough) _UNCAUGHT_ handlers. These are the last ditch attempt / safety net for your code. It is STILL your responsibility to pre-detect the potential errors and code around them. A try/catch block will be enough, as demonstrated - I successfully capture a divide by zero. Richard. -- ----- Richard Quadling "Standing on the shoulders of some very clever giants!" EE : http://www.experts-exchange.com/M_248814.html Zend Certified Engineer : http://zend.com/zce.php?c=ZEND002498&r=213474731 ZOPA : http://uk.zopa.com/member/RQuadling -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
