dimenticavo, l'array in input è:

Array ( [0] => Array ( [0] => 2007-07-23 08 [1] => 1 ) [1] => Array ( [0] => 2007-07-23 09 [1] => 3 ) [2] => Array ( [0] => 2007-07-23 10 [1] => 2 ) )