How to get slice of an array where date is the key of array?

I have an array that has date (e.g "2011-10-31") as key and some value associated w开发者_Python百科ith it. The array is sorted. Now, I want to slice the array by giving starting date and ending date? How can I do it in PHP?

Simple loop over it:

function getRange($array, $start, $end) {
    $inRange = false;
    $result = array();
    foreach($array as $date => $value) {
        if($date >= $start && !$inRange) {
            $inRange = true;
        }
        if($date > $end) {
            break;
        }
        if($inRange) {
            $result[$date] = $value;
        }
    }
    return $result;
}

If start and end date match the keys in the array exactly, you could also use a combination of array_keys, array_search and array_slice (but might not be faster):

function getRange($array, $start, $end) {
    $keys = array_keys($array);
    $starti = array_search($start, $keys);
    $endi = array_search($end, $keys);
    return array_slice($array, $starti, $endi-$starti+1);
}

I assumed you want to have the start and end date in the result array.

Of course you have to think about what you should happen if the start and/or end date are not in the array.