$a = 25; $b = 10; //addition and assign value to $a echo $a += $b; echo '
'; //subtraction and assign value to $a echo $a -= $b; echo '
'; //multiplication and assign value to $a echo $a *= $b; echo '
'; //division and assign value to $a echo $a /= $b; echo '
'; //do modulus and assign value to $a echo $a %= $b; echo '
'; //do exponentiation and assign value to $a echo $a **= $b; echo '
';
Hello World!