Re: [PHP] Re: UNLESS Statement Equivalent

2013/3/12 Ford, Mike <[email protected]>

> > -----Original Message-----
> > From: Maciek Sokolewicz [mailto:[email protected]] 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: [email protected]     T: +44 113 812 4730
>
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