Boyd, Todd M. schreef: >> -----Original Message----- >> From: Alice Wei [mailto:ajwei@xxxxxxxxxxxxx] >> Sent: Thursday, January 29, 2009 3:02 PM >> To: php-general@xxxxxxxxxxxxx >> Subject: Switch statement Question >> >> >> Hi, >> >> I have a code snippet here as in the following: >> >> //Switch statements between the four options >> switch($string) { >> case "": >> $string= "NOT book.author='All'"; >> break; >> default: >> $string= $string . "AND NOT book.author='All'"; >> break; >> } >> This code does work, but I am wondering if it is possible in the >> switch statement clauses for me to do something like case does not >> equal to a certain author name if I don't want $string with that >> content to be processed. or, do I always use default in this case? > > It's a bit non-conventional, but the switch block can be used like so: > > switch(true) { > case (x < y): > dosomething(); > break; > case (y == 0): > dosomethingelse(); > break; > default: > somethingelseentirely(); > break; > } some people really don't like this kind of thing (hi Robbert :-)), either way beware that the equality test is not strict, that is to say autocasting occurs (variable type doesn't have to match) an example: switch (true) { case 1: echo "did you expect this?\n"; // <-- this is output break; case true: echo "or this?\n"; break; } > ...this way, your case statements can be expressions themselves, and it > will always pick at least one of them to fire. > > HTH, > > > // Todd > -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
