Description:
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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.