$x++ and $x-- and --$x .....?????l dont new

Answer 1

yes.
1. y = 4, afrer x=3 (not y)
2. first x=3, after y=x (y=3)

Answer 2

incriment and decrement.
the diffirence:
x=5
when y=x++ then y=5, and after that x=6.
when y=++x then x=6, and after that y=6.

same with x-- and --x

Answer 3

x=4;
y=x--; =>. y= 4 after 3
y=--x; =>. y=3 after 3
yes or no