Allows you to write php code like:

function test($x,$y){
echo $x;
yield($x,$y);
echo $y;
yield($y,$x);
}

test(1,2)[$a,$b | echo $a*$b];

test(2,3)[$a,$b | $a = $b+$a; echo $b*($a+$b)];

#Or bring it back the other way:
[$a, $b | echo $a*$b](1,2);

#Inline lambdas + dot notation + dropped brackets? oh my.
$object.method_awaiting_yield [$x | return $x+1];Check out the http://code.google.com/p/phpuby/wiki/syntax wiki for more interesting examples and ideas.