Shorter: $x = 1-!$y

Better, IMO, but much depends on what the reader knows about x and y from the surrounding code: 

  $x = 0;
  if ($y) {
     $x = 1;
     ...
  }

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In reply to Re: Better expression for $x = !!$y||0 by ysth
in thread Better expression for $x = !!$y||0 by borisz

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