From: php at richardneill dot org
Operating system:
PHP version: 6CVS-2008-10-06 (CVS)
PHP Bug Type: Feature/Change Request
Bug description: wish: compound logical operators (nand, xor, etc)
Description:
------------
This is a request for a new set of functions, namely the more complex
logical operations, NAND, NOR, XOR, XNOR etc. I suggest implementing them
as functions, rather than as operators, because they can take a variable
number of arguments. These would also be distinct from the bitwise
operators.
Of course these are pretty trivial to implement oneself as and when
needed, but it would make a small increment of improvement to PHP ;-)
The other advantage is in code-readability. I think that example1 is more
readable than example2:
$example1 = nand ($condition_1, $condition_2, $condition_3, $condition_4)
$example2 = (! ($condition_1 and $condition_2 and $condition3 and
$condition_4)
Thanks for your time and consideration - Richard
Reproduce code:
---------------
A possible implementation:
function nand($a,$b,$c,....){
#cast everything to boolean
return !($a and $b and $c ...);
}
function nor($a,$b,$c,...){
#cast to boolean
return !($a or $b or $c or ...);
}
function new_and($a,$b,$c,...){
#note: this makes the syntax much clearer and shorter if
#there are very many inputs.
return ($a and $b and $c...);
}
#similarly, new_or()
function xor($a,$b,$c,...){
$count=0;
if ($a){ $count++ ;}
if ($b){ $count++ ;}
if ($c){ $count++ ;}
...
return ($count == 1);
}
function xnor($a,$b,$c,...){
$count=0;
if ($a){ $count++ ;}
if ($b){ $count++ ;}
if ($c){ $count++ ;}
...
return ($count != 1);
}
function majority($a,$b,$c,...){
$count=0;
if ($a){ $count++ ;}
if ($b){ $count++ ;}
if ($c){ $count++ ;}
..
return ($count > $number_of_args/2);
}
#and any others I've missed out.
--
Edit bug report at http://bugs.php.net/?id=46239&edit=1
--
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=46239&r=trysnapshot52
Try a CVS snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=46239&r=trysnapshot53
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=46239&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=46239&r=fixedcvs
Fixed in release:
http://bugs.php.net/fix.php?id=46239&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=46239&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=46239&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=46239&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=46239&r=support
Expected behavior: http://bugs.php.net/fix.php?id=46239&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=46239&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=46239&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=46239&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=46239&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=46239&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=46239&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=46239&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=46239&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=46239&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=46239&r=mysqlcfg
