Math in PHP

"; $num1 = 8; $num2 = 5; echo "Addition: 8 + 5 = "; echo $num1 + $num2; echo "
"; echo " Subtraction: 8 - 5 = "; echo $num1 - $num2; echo "
"; echo " Multiplication: 8 × 5 = "; echo $num1 * $num2; echo "
"; echo " Division: 8 / 5 = "; echo $num1 / $num2; echo "
"; echo " MOD: 8 % 5 = "; echo $num1 % $num2; echo "
"; echo " increment
"; echo " post-increment 8++ ="; $num3 = $num1++; echo $num3; echo "
pre-increment ++5 =" ; $num4 =++$num2; echo $num4; echo "
decrement
"; echo " post- decrement 9-- ="; $num3 = $num1--; echo $num3; echo "
pre- decrement --6 =" ; $num4 =--$num2; echo $num4; echo "
varaible "; echo "
x+=10 → x=x+10 "; echo "
x-=10 → x=x-10 "; echo "
x*=10 → x=x*10 "; echo "
x/=10 → x=x/10 "; echo "
x%=10 → x=x%10 "; echo "

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math in PHP