display 30 dates starting from today

how can I print the last thirty dates. Starting from today:
Example:
2011 09 13
2011 09 12
......
2011 08 14


Thanks..

for($i = 0; $i < 30; $i++)
echo date('Y m d', strtotime('today + ' . $i . ' day')), '<br />';

I am printing the last 30 days starting from today.
i want to print the current date and also the the day after the current date in the next line. The below code does not seem to work correctly..

for($i = 0; $i < 30; $i++)
{

$d[$i]=strtotime('today - ' . $i . ' day');
echo "D:".date('Y m d', $d[$i])."<br>";
echo "D+1:".date('Y m d', $d[$i+1])."<br>";
}

I mean it odes not print the D+1 value correctly..

You say the day after. Do you mean one more day back or one day forward?
This shows the next day back, change the -1 to +1 if you want the other way.

<?php
for($i = 0; $i < 30; $i++)
{
$y=$i+1;
$d[$i]=strtotime('today - ' . $i . ' day');
$d1[$i]=strtotime('today - ' . $y . ' day');
echo "D:".date('Y m d', $d[$i])."<br>";
echo "D+1:".date('Y m d', $d1[$i])."<br>";
}
?>

for($i = 0; $i < 30; $i++)
{

$d[$i]=strtotime('today - ' . $i . ' day');
$d1[$i]=strtotime('today - ' . $i+1 . ' day');
echo "D:".date('Y m d', $d[$i])."<br>";
echo "D+1:".date('Y m d', $d1[$i])."<br>";
}

It prints the same date again..it does not increment the value for D+1:
D:2011 09 13
D+1:2011 09 14
D:2011 09 12
D+1:2011 09 14
D:2011 09 11
D+1:2011 09 14
D:2011 09 10
...

never mind..i missed the y variable..

But it prints the first value of D+1 as 1969-...
for($i = 0; $i < 30; $i++)
{
$y=$i-1;
$d[$i]=strtotime('today - ' . $i . ' day');
$d1[$i]=strtotime('today - ' . $y . ' day');
echo "D:".date('Y m d', $d[$i])."<br>";
echo "D+1:".date('Y m d', $d1[$i])."<br>";
}

D:2011 09 13
D+1:1969 12 31
D:2011 09 12
D+1:2011 09 13
D:2011 09 11

Whoops. I misread what you asked for. Try this for the last 30 days:
for($i = 0; $i < 30; $i++)
echo date('Y m d', strtotime('today' . ($i > 0 ? ' - ' . $i . ' day' : ''))), '<br />';

// Or
echo date('Y m d'), '<br />';
for($i = 1; $i < 30; $i++)
echo date('Y m d', strtotime('today - ' . $i . ' day')), '<br />';

I would have done this differently, but I want your opinion on whether it's better/worse than what's already been posted - or just different.

// timestamp for right now
$now = time();

// a day in seconds
$day = 60*60*24;

// Start $i at $now timestamp, increment it by 1 day until it's 30 days (< 31)
// For last 30 days, change += to -=
for($i = $now; $i < ($now+($day*31)); $i += $day ){
echo date("d-m-Y",$i)."\n";
}

That depends on your criteria for better or worse. Mine is shorter and easier to read, but yours might be faster(by a few ms, though you could optimize it some more). The output(other than the date format and newline) appears to be the same.

My criteria was exactly on those comparisons, but I wasn't sure about the time. I didn't think there would be much in it, but I don't entirely know how the strtotime() actually parses the 'today' operand. Thanks for your input :)