Randomize multiple arrays

[VBunny_ohplease]

I work on an online game (for fun) which requires me to randomize names of "card images" (with numbers).  However, some card decks have 20 images, and some have 15.

 

I have the seperate decks randomizing names on their own:

 

$character = array (

"alice", "jasmine", "peach"

);

 

$scenary = array (

"palace", "forest", "dungeon"

);

 

 

I am wondering how to randomize both of the arrays, so everyone has an equal chance of getting either "character" or "scenary".

 

I've tried things like:

$blech=$character[array_rand($character,1)] && scenary[array_rand($scenary,1)];

 

 

And I can't find any tutorials on this sort of thing, or what it's called.

[salathe]

If deck A had two cards and B ten cards, would the chances of getting a card from A or B still be equal?

[VBunny_ohplease]

I guess the real problem is, I want both card sets to be in the system but I cannot figure out how to have both sets be randomized within the same array.