php get all posible key combinations from one array [duplicate]

Question

I have this array : (always an even number of values in array but bigger than 8, half of the array's value is also even);

$array = array("apple", "banana", "pear", "grape", "cherry", "orange", "pineapple", "kiwi");

The result i want :

array(
[0] => array(apple => "banana", pear => "grape", cherry => "orange", pineapple => "kiwi"),
[1] => array(grape => "apple", banana => "pear", orange => "pineapple", kiwi => "cherry"),
...etc
[7] => array(banana => "apple", grape => "pear", orange => "cherry", kiwi => "pineapple"),
[8] => array(apple => "grape", pear => "banana", pineapple => "orange", cherry => "kiwi"), 
...etc until [13]
)

As you can see, each value is sometimes a key and sometimes a value, all possible combinations must be made except the same values ( apple with apple must not meet ).

if the first encounter [0] "apple" is a key, in the next encounter [1] it should be a value

The same two values ( apple and banana ) cannot meet again until the ending half of the array.

Anyone can help me out with this ?

i only found part of the problem there, the part that i am most interested is if the first encounter [0] "apple" is a key, in the next encounter [1] it should be a value The same two values ( apple and banana ) cannot meet again until the ending half of the array. — Rares Hideg
– Rares Hideg, Commented Oct 3, 2013 at 21:32
Actually no, because in the same array result value where apple meets banana, other keys also meet, counting all of the keys+values combinations yes, there could be 64-8 or 64 if apple would meet apple, but counting only the main array keys , the result should contain 14 keys, now that i say that i noticed I've wrote 15. it should go from 0 to 13. — Rares Hideg
– Rares Hideg, Commented Oct 3, 2013 at 21:43

Rares Hideg · Accepted Answer · 2013-10-05 21:03:40Z

0

I have found my answer thanks to google.

The most appropriate reference to my question is sports team fixtures. Searching that on google found me the answer.

answered Oct 5, 2013 at 21:03

Rares Hideg

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