PHP Numbers

Question 1

Secuencia de orden de operadores aritmeticos en PHP

Answer 1

Any operation wrapped in parentheses (())
Exponents (**)
Multiplication (*) and division (/)
Addition (+) and subtraction (-).

Question 2

Short syntax de operaciones

Answer 2

$x += $y
$x -= $y
$x *= $y
$x /= $y
$x %= $y