Help retrieve the solution for the last day of any month

For example, I want to output the last day of the month, 20120531, and echo 'the last day of the month is :'. date ('Y-m-t', strtotime ('thismonth');, $ day = '000000'; $ days = date ('t ', strtotime
For example, if I want to output the last day of the month, 20120531

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Echo 'the last day of this month is: '. date ('Y-m-t', strtotime ('this month '));
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$ Day = '000000 ';
$ Days = date ('t', strtotime ($ day ));
$ D = date ("j", strtotime ($ day ));
Echo date ("Y-m-d", strtotime ($ days-$ d). "day $ day "));
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Echo "date of the last day of the month:". date ('Y-m-t ');

If any month is used, the timestamp data is assigned to the date function.