My old array
array:7 [
0 => "22-Feb-2017"
1 => "22-Feb-2017"
2 => "22-Feb-2017"
3 => "27-May-2015"
4 => "10-May-2015"
5 => "10-May-2015"
6 => "08-May-2015"
]
I want new array as
array:7 [
22-Feb-2017 => "3"
27-May-2015 => "1"
10-May-2015 => "2"
08-May-2015 => "1"
]