php check if date is older than 1 month code example

Example 1: php date today plus 1 month

$future_timestamp = strtotime("+1 month");
$data = date('Y-m-d', $future_timestamp);

Example 2: php check if day in month

// function
cal_days_in_month(calendar,month,year);
//e.g.
$d=cal_days_in_month(CAL_GREGORIAN,10,2005);
echo "There was $d days in October 2005";