Code _php tips for PHP to show start/end timestamps for today, this month, last month, and this year

$t = time ();
$t 1 = mktime (0,0,0,date ("M", $t), date ("D", $t), date ("Y", $t));
$t 2 = mktime (0,0,0,date ("M", $t), 1,date ("Y", $t));
$t 3 = mktime (0,0,0,date ("M", $t) -1,1,date ("Y", $t));
$t 4 = mktime (0,0,0,1,1,date ("Y", $t));
$e 1 = mktime (23,59,59,date ("M", $t), date ("D", $t), date ("Y", $t));
$e 2 = mktime (23,59,59,date ("M", $t), date ("T"), Date ("Y", $t));
$e 3 = mktime (23,59,59,date ("M", $t) -1,date ("T", $t 3), date ("Y", $t));
$e 4 = mktime (23,59,59,12,31,date ("Y", $t));
Test
echo Date ("Current y-m-d h:i:s", $t). "$t <br>";
Echo Date ("Today's beginning y-m-d h:i:s", $t 1). "$t 1<br>";
echo Date ("Beginning of this month y-m-d h:i:s", $t 2). "$t 2<br>";
echo Date ("Beginning of last month y-m-d h:i:s", $t 3). "$t 3<br>";
echo Date ("Beginning of this year y-m-d h:i:s", $t 4). "$t 4<br>";
Test
Echo Date ("Today's End y-m-d h:i:s", $e 1). "$e 1<br>";
Echo Date ("The end of this month y-m-d h:i:s", $e 2). "$e 2<br>";
echo Date ("End of last month y-m-d h:i:s", $e 3). "$e 3<br>";
Echo Date ("The end of this year y-m-d h:i:s", $e 4). "$e 4<br>";
Results:
Current 2011-05-24 15:42:55 1306222975
Today's beginning 2011-05-24 00:00:00 1306166400
Beginning of this month 2011-05-01 00:00:00 1304179200
Beginning of last month 2011-04-01 00:00:00 1301587200
Beginning of this year 2011-01-01 00:00:00 1293811200
Today's End 2011-05-24 23:59:59 1306252799
End of this month 2011-05-31 23:59:59 1306857599
Last month's End 2011-04-30 23:59:59 1304179199
End of this year 2011-12-31 23:59:59 1325347199