note 97203 added to function.trigger-error

In reply to mano at easymail, I really like your idea. I wish I'd have seen it sooner, I then might have actually used it on some PHP 4 projects I've been working on recently. The only thing is that statements after the error-throwing-statement--inside the try-clause--should be omitted. My proposal is adding an in_try() function. I've converted your arrays to Exception objects, and made a few functions to make the code "look" more like they are actually try-catch ;) They are probably more convenient to use like this and they might even be easier to (mass)replace later on into PHP 5 code. The usage of $GLOBALS could be replaced with a Singleton. To keep it short I omitted a few properties and get**/set** methods in Exception. <?php class Exception { var $_message = NULL; function Exception($message = '') { $this->_message = $message; } function getMessage() { return $this->_message; } } class BadGirlException extends Exception { } // Try-catch functions function try() { $GLOBALS['exception'] = NULL; } function in_try() { return ($GLOBALS['exception'] === NULL); } function &catch(&$ex) { $ex = $GLOBALS['exception']; return $ex; } function throw($exception) { $GLOBALS['exception'] = $exception; trigger_error($exception->getMessage(), E_USER_NOTICE); } // Try-catch uses error handler to get filename, line number etc. function try_catch_error_handler($errno, $errstr, $errfile, $errline) { if (is_object($GLOBALS['exception'])) { // commented in this example //$GLOBALS['exception']->setErrorNo($errno); //(....) // don't execute internal php error handler return true; } else { // do execute internal php error handler return false; } } set_error_handler('try_catch_error_handler'); /** * Badgirl function, get candy etc. * * @return boolean succesful execution * @throws BadGirlException */ function badgirl() { $canHaveCandy = false; if (!$canHaveCandy) { return throw(new BadGirlException('Badgirls are not allowed to have candy')); } else { return true; } } try(); { if (in_try()) $sheis = badgirl(); if (in_try()) print "this line is not seen in case an exception occurred.\n"; } switch (get_class(catch($ex))) { case 'badgirlexception': printf("badgirl() throws exception: %s\n", $ex->getMessage()); print_r($ex); break; case 'exception': default: print_r($ex); break; } print "end of program"; /** Program output (in case Exception::setErrorStr etc., have been implemented): * * badgirl() throws exception: Badgirls are not allowed to have candy * badgirlexception Object * ( * [_message] => Badgirls are not allowed to have candy * [_errno] => 512 * [_errstr] => Badgirls are not allowed to have candy * [_errfile] => /home/ray/test.php * [_errline] => 68 * [_trace] => Array * ( * [0] => Array * ( * [function] => try_catch_error_handler * [args] => Array * ( * [0] => 512 * [1] => Badgirls are not allowed to have candy * (.....) * * ) * * ) * end of program */ ?> ---- Server IP: 91.199.167.223 Probable Submitter: 81.18.253.210 ---- Manual Page -- http://www.php.net/manual/en/function.trigger-error.php Edit -- https://master.php.net/note/edit/97203 Del: integrated -- https://master.php.net/note/delete/97203/integrated Del: useless -- https://master.php.net/note/delete/97203/useless Del: bad code -- https://master.php.net/note/delete/97203/bad+code Del: spam -- https://master.php.net/note/delete/97203/spam Del: non-english -- https://master.php.net/note/delete/97203/non-english Del: in docs -- https://master.php.net/note/delete/97203/in+docs Del: other reasons-- https://master.php.net/note/delete/97203 Reject -- https://master.php.net/note/reject/97203 Search -- https://master.php.net/manage/user-notes.php