How do i sort in perl my hash array on the key?

Question

I have a calendar filled with daily hours from persons. I like to sort my hours per day.. i already counted the hours.

loop....
    # $daguren  1..31
    # uren = sum of all the daily hours
    $daguren{$dag} += $workedhours;
...loop

# i like to sort it on "daguren" that is a number 1 .. 31   
while (($dag,$uren)=each %daguren){
    print "dag=$dag uren=$uren<br>\n";
}

Answer 1

You want to iterate over the keys

# This sorts by working hours
my @sorted_keys = sort { $daguren{$a} <=> $daguren{$b} } keys %daguren;

# This sorts by date
my @sorted_keys = sort { $a <=> $b } keys %daguren;

foreach my $dag ( @sorted_keys )
{
     my $uren = $daguren{$dag};
     print "dag=$dag uren=$uren<br>\n";
}