Question

I have an array

$hourly = array(
        "01" => "0",
        "02" => "0",
        "03" => "0",
        "04" => "0",
        "05" => "0",
        "06" => "0",
        "07" => "0",
        "08" => "0",
        "09" => "0",
        "10" => "0",
        "11" => "0",
        "12" => "0",
        "13" => "0",
        "14" => "0",
        "15" => "0",
        "16" => "0",
        "17" => "0",
        "18" => "0",
        "19" => "0",
        "20" => "0",
        "21" => "0",
        "22" => "0",
        "23" => "0"
            );

And I have a bunch of data like “01” and “03” and “21” and I want to add (+1) to that specific value in the array. So with the data set “01”,”03″,”21″,”01″,”22″ the resulting array would be

$hourly = array(
        "01" => "2",
        "02" => "0",
        "03" => "1",
        "04" => "0",
        "05" => "0",
        "06" => "0",
        "07" => "0",
        "08" => "0",
        "09" => "0",
        "10" => "0",
        "11" => "0",
        "12" => "0",
        "13" => "0",
        "14" => "0",
        "15" => "0",
        "16" => "0",
        "17" => "0",
        "18" => "0",
        "19" => "0",
        "20" => "0",
        "21" => "1",
        "22" => "1",
        "23" => "0"
            );

How could I go about doing that? Is there a function to add 1 to an array element?

Answer 1

$hours = array("01", "03", "21" );
foreach($hours as $hour) {
   $hourly[$hour] += 1;
}