After little searching got solution on this
$data = array_map("str_getcsv", preg_split('/\r*\n+|\r+/', $string_data));
print_r($data);
Giving me array like this
Array
(
[0] => Array
(
[0] => Date
[1] => Name
[2] => Hours
)
[1] => Array
(
[0] => 2013-01-02
[1] => Test User
[2] => 7:59
)
[2] => Array
(
[0] => 2013-01-03
[1] => Test User
[2] => 7:53
)
[3] => Array
(
[0] => 2013-01-04
[1] => Test User
[2] => 8:12
)
[4] => Array
(
[0] => 2013-01-07
[1] => Test User
[2] => 7:56
)
[5] => Array
(
[0] => 2013-01-08
[1] => Test User
[2] => 8:25
)
[6] => Array
(
[0] => 2013-01-09
[1] => Test User
[2] => 7:56
)
[7] => Array
(
[0] => 2013-01-10
[1] => Test User
[2] => 8:10
)...