why result is 7?

[eluser]pincs[/eluser]
[quote author="daelsepara" date="1277110704"]first statement:

Code:

// (1) + (2) + (3) = 7

second statement:

Code:

// (2) + (3) + (4) = 9

[/quote]


i think first statment like this:2+3+4

Code:

echo "i=".(++$i);//2
echo "i=".(++$i)+12;//12
echo "i=".(++$i)+(++$i);//3