Swap Two number Program in PHP Swap two number with each other means interchange their value. Suppose you have two number a and b a contain 6 and b contain value 5 after swap their value, a have 5 and b have 6. basically 2 method of interchange value a-using third variable, b-without using third variable(Using Arithmetic Operators), c-usign multiplication, d-bitwaise XOR operation, a-swap two number using third <?php $a=10; $b=20; echo "Value of a: $a</br>"; echo "Value of b: $b</br>"; $a=$a+$b; $b=$a-$b; $a=$a-$b; echo "Value of a: $a</br>"; echo "Value of b: $b</br>"; ?> b-without using third variable(Using Arithmetic Operators), wap two number with each other means interchange their value. Suppose you have two number a and b a contain 10 and b contain value 20 after swap their value, a have 20 and b have 10. <?php $a=10; $b=20; echo "Value of a: $a</b...