*Given two variables, A and B say, exchange their values so that A has the previous value of B and B has the previous value of A.*

The simple solution is to use a third variable:

`<?`

` // set values for the variables`

` $a = 3;`

` $b = 7;`

` `

` // save a to a new variable called c`

` $c = $a;`

` // a is now stored somewhere else, so override it with b`

` $a = $b;`

` // b is now stored in a, so update that to c`

` $b = $c;`

` `

` // output the variables`

` echo 'A = ' . $a . ', B = ' . $b; `

`?>`

Which produces:

A = 7, B = 3

- March 28, 2005 - Added solution 1.

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