使用键作为时间对数组进行排序，格式为xx：xx

Question

I have this associate array below

["12:00" => "Lunch", "07:00" => "Arrival", "07:15" => "Start Tour"]

I want to print it in as below ascending by time (key)

7:00 => Arrival
7:15 => Start Tour
12:00 => Lunch

So far what I've tried is below

$arr = ["12:00" => "Lunch", "07:00" => "Arrival", "07:15" => "Start Tour"];

function timecomp($a,$b)
{
    // Subtracting the UNIX timestamps from each other.
    // Returns a negative number if $b is a date before $a,
    // otherwise positive.
    return strtotime($b[0])-strtotime($a[0]);
}
uasort($arr,'timecomp');

print_r($arr);

It print this

Array
(
    [07:15] => Start Tour
    [07:00] => Arrival
    [12:00] => Lunch
)

Answer 1

As long as your time strings use 24-hour hours and leading zeroes, you can just use ksort():

$a = ["12:00" => "Lunch", "07:00" => "Arrival", "07:15" => "Start Tour"];
ksort($a);
print_r($a);

Result:

Array
(
    [07:00] => Arrival
    [07:15] => Start Tour
    [12:00] => Lunch
)