2013/3/12 Ford, Mike <m.f...@leedsmet.ac.uk> > > -----Original Message----- > > From: Maciek Sokolewicz [mailto:tula...@gmail.com] On Behalf Of > > Maciek Sokolewicz > > Sent: 11 March 2013 22:44 > > > > > unless ( $a and $b ) > > = > > if ( ! ($a and $b) ) > > > > So in simple terms, just stick a ! (or the keyword not) in front of > > your > > expression, and you'll have exactly what you want: > > if( not ( ($current_page == $saved_page) and ($current_ip == > > $saved_ip) > > and ($current_dt < ($saved_dt + 3600) ) ) { > > Whilst this is true as far as it goes, I would suggest applying deMorgan's > laws > to simplify slightly to > > if ( ($current_page != $saved_page) or ($current_ip != $saved_ip) or > ($current_dt >= ($saved_dt + 3600) ) ) >
If it is simpler depends, because not ($everything && $must && $be && $true) is sometimes more logical :) > > Also, the keyword versions of the Boolean operators are very low > priority, which is why you need all those extra parentheses -- if > you switch to the symbolic versions, you can leave all the internal > parentheses out to give: > > if ($current_page != $saved_page || $current_ip != $saved_ip || > $current_dt >= $saved_dt + 3600) > > Just to throw that in if (array($current_page, $current_ip, $current_dt) != array($saved_page, $saved_ip, $saved_dt + 3600)) This at least includes the information, that you have to sets of values, that should be equal :) > > Cheers! > > Mike > > -- > Mike Ford, > Electronic Information Developer, Libraries and Learning Innovation, > Portland PD507, City Campus, Leeds Metropolitan University, > Portland Way, LEEDS, LS1 3HE, United Kingdom > E: m.f...@leedsmet.ac.uk T: +44 113 812 4730 > > > > > > To view the terms under which this email is distributed, please go to > http://disclaimer.leedsmet.ac.uk/email.htm > > -- > PHP General Mailing List (http://www.php.net/) > To unsubscribe, visit: http://www.php.net/unsub.php > > -- github.com/KingCrunch
