The array is divided into two parts

The array is divided into two sections
A one-dimensional array, note that the key name is irregular and non-numeric:
$arr =array (' WC ' =>12, ' WSSC ' =>123, ' WAC ' =>142 ', ' =>124 ', ' WAC ' =>012, ' wsbsc ' =>012c3, ' WAC ' = 014d2 ', W3ec ' =>0124);
It is now divided into two parts, namely:
$arr 1=array (' WC ' =>12, ' WSSC ' =>123, ' WAC ' =>142 ', ' =>124 ');
And
$arr 2=array (' WAC ' =>012, ' wsbsc ' =>012c3, ' WAC ' =>014d2 ', W3ec ' =>0124 ');

To find this algorithm

------Solution--------------------
You didn't specify any division rules--

Array_chunk ()
Or
Array_slice ()
------Solution--------------------
The condition of the original split is obviously, to determine whether the first character is 0.
Unfortunately, your problem is wrong, because the association key WAC is duplicated. So the array $arr only 7 items
An array of 7 items split into a total of 8 items, because the condition is not sufficient, so no solution!


You're not challenging our IQ, are you?
------Solution--------------------
Regardless of your array there are no errors, but this method should be feasible (elements of an even number, or odd number, the number of a few):
Asort ($arr);
Then intercept the front to OK. For interception, you can use a function, or you can assign a value to another array

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