2 arrays count how many times id = date - php

Question

Ive sat with this for a while now, and its getting late.
Im trying to get a top 3 of most sales from last month, and i need to count how many times a id from array 1 is equal to array 2 last month(6 = last atm.) like id 4 = 2, id 7 = 3
It might not be the perfect solution, but im just trying to break it down by my self, so later on 'maybe' problems, will i take care of when i hit the wall,
so please, if anyone can help me here, ill be greatfull.
UPDATE
- I will add the result im looking for here: (sorry i didnt before, it makes it alot easier :-)
- The result below, is because i want the count from 2014-06-01 and up to the last day of that month monly, on array[0][1] under this array, only 6-7-8 is not from 2014-06
Hope it makes a bit more sense now ^^
Array
(
[0] => Array
(
[0] => Array
(
[4] => 2
[7] => 3
[1] => 2
[3] => 2
[9] => 1
[12] => 1
[2] => 1
[13] => 1
)
)
)
Array
(
[0] => Array
(
[0] => Array
(
[0] => 4
[1] => 4
[2] => 7
[3] => 1
[4] => 7
[5] => 7
[6] => 3
[7] => 3
[8] => 4
[9] => 9
[10] => 12
[11] => 2
[12] => 13
[13] => 1
)
[1] => Array
(
[0] => 2014-06-18
[1] => 2014-06-10
[2] => 2014-06-05
[3] => 2014-06-05
[4] => 2014-06-12
[5] => 2014-06-11
[6] => 2013-12-12
[7] => 2014-07-23
[8] => 2014-05-13
[9] => 2014-06-01
[10] => 2014-06-12
[11] => 2014-06-04
[12] => 2014-06-04
[13] => 2014-06-11
)
)
)

Answer 1

I hope that what I understood is what you're really asking for. let's say your array definition is :
$arr = Array
(
0 => Array
(
0 => Array
(
0 => 4,
1 => 4,
2 => 7,
3 => 1,
4 => 7,
5 => 7,
6 => 3,
7 => 3,
8 => 4,
9 => 9,
10 => 12,
11 => 2,
12 => 13,
13 => 1
),
1 => Array
(
0 => "2014-06-18",
1 => "2014-06-10",
2 => "2014-06-05",
3 => "2014-06-05",
4 => "2014-06-12",
5 => "2014-06-11",
6 => "2013-12-12",
7 => "2014-07-23",
8 => "2014-05-13",
9 => "2014-06-01",
10 => "2014-06-12",
11 => "2014-06-04",
12 => "2014-06-04",
13 => "2014-06-11"
)
)
);
If you need to test if the date is lower than 6 month and then put their id, sales and date you need to use this code
$result = [];
$index=0;
foreach ($arr[0][0] as $key => $value)
{
$date1 = new DateTime($arr[0][1][$key]);
$date2 = new DateTime();
$diff = $date1->diff($date2);
$diff = ($diff->format('%y') * 12) + $diff->format('%m');
if($diff<=6)
{
$result[$index]['id'] = $key;
$result[$index]['sales'] = $value;
$result[$index]['date'] = $arr[0][1][$key];
$index++;
}
}
var_dump($result);

Answer 2

array_count_values() will give you the number of times each value appears in array 1.
$count = array_count_values($array[0][0]);
Result:
Array
(
[4] => 3
[7] => 3
[1] => 2
[3] => 2
[9] => 1
[12] => 1
[2] => 1
[13] => 1
)
Then you can use a loop to combine with array 2:
$result = array();
foreach($count as $key=>$val) {
$result[$array[0][1][$key]] = $val;
}
Result:
Array
(
[2014-06-12] => 3
[2014-07-23] => 3
[2014-06-10] => 2
[2014-06-05] => 1
[2014-06-01] => 1
[2014-06-04] => 1
[2014-06-11] => 1
)
See demo