RE: [PHP] Re: UNLESS Statement Equivalent

> -----Original Message----- > From: Maciek Sokolewicz [mailto:tularis@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 >= ($saved_dt + 3600) ) ) Also, the keyword versions of the Boolean operators are very low priority, which is why you need all those extra parentheses -- if you switch to the symbolic versions, you can leave all the internal parentheses out to give: if ($current_page != $saved_page || $current_ip != $saved_ip || $current_dt >= $saved_dt + 3600) 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.ford@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