gistfile1.txt

<?php

//Simplest solution to swap values between 2 variables

a=10;
b=20;

//now we want that a=20 and b=10; 

we take new variable "C"

c=a; // c has 10 value
a=b; // a has 20 value
b=c; // b has 10 values now

//values are swapped
?>