Definition: Warnings or more critical errors have to be thrown as exceptions

[tristanlins]

function exception_error_handler($errno, $errstr, $errfile, $errline ) {
    throw new ErrorException($errstr, $errno, 0, $errfile, $errline);
}
set_error_handler("exception_error_handler", E_ALL ^ E_NOTICE ^ E_USER_NOTICE);

[discordier]

seconded