array_rand() Example

Refreshing the screen should produce different results (sometimes they'll be the same though since php's random function isn't that good)

Original Array Values
Array ( [First] => John [Second] => Jane [Third] => Nick [Fourth] => Betty )

Randomly selected keys array
Array ( [0] => First [1] => Second [2] => Third [3] => Fourth )

Using foreach loop
John
Jane
Nick
Betty

Using regular for loop
John
Jane
Nick
Betty