variables

Question 1

add a value to a variable

Answer 1

$x += 10;

Question 2

subtract a value from a variable

Answer 2

$x -= 10;

Question 3

increment the value of a variable by 1

Answer 3

++$x;

Question 4

decrement the value of a variable by 1

Answer 4

–$y;

Question 5

if (++$x == 10) echo $x;

Answer 5

first increment the value of #x and then test whether it has the value 10; if it does, output its value.

Question 6

if ($y– == 0) echo $y;

Answer 6

test if the value is equal to 0; if it is output the value, if its not decrement the value of $y by 1