PHP

php ++

// POST INCREMENTING
$i = 10;
$a = $i++;
// Now $a is 10, and $i is 11

//PRE INCREMENTING : it is FASTER (-10% than previous above)
$i = 10;
$a = ++$i;
// Now $a is 11, and $i is 11

php +=

$my_var = "foo";
$my_var .= " bar";
echo($my_var);
// foo bar