数组比较和计数具有相似值和不相似的值

Question

我有一种情况，我必须比较动态数组，并仅获取前四个键具有相似值的数组的计数。例如：

Array[0]
(
    [item] => 1
    [size] => 1
    [pair] => 1
    [pay] => 1
    [name] => 
    [msg] => 
    [email] => 
    [b19e19b13682bcfef93651c86f9ad9e6] => eih6j74035oj17bvnses32km23
)
Array[1]
(
    [item] => 1
    [size] => 2
    [pair] => 1
    [pay] => 1
    [name] => 
    [msg] => 
    [email] => 
    [b19e19b13682bcfef93651c86f9ad9e6] => eih6j74035oj17bvnses32km23
)
Array[2]
(
    [item] => 1
    [size] => 2
    [pair] => 2
    [pay] => 2
    [name] => 
    [msg] => 
    [email] => 
    [b19e19b13682bcfef93651c86f9ad9e6] => eih6j74035oj17bvnses32km23
)
Array[3]
(
    [item] => 1
    [size] => 1
    [pair] => 1
    [pay] => 1
    [name] => 
    [msg] => 
    [email] => 
    [b19e19b13682bcfef93651c86f9ad9e6] => eih6j74035oj17bvnses32km23
)

我有上面的一组数组，其中第一次和最后一次迭代具有相似的值（对于第一个四个键）。为此，我必须推导出类似 (0,3)、(1)、(2) 的内容。有什么解决办法吗？