/***根据$endtime,返回指定$monthes月之前的日*/function severalmonthago($endtime,$monthes){if (!$endtime) { return false;}if (!is_int($monthes) || $monthes $monthes){ $res_y = $y; $res_m = $m-$monthes; $t = date(t,strtotime($res_y.-.$res_m.-01)); if($d0){ $y = $y-$year; $monthes = $monthes_mod; if($m $monthes){ $res_y = $y; $res_m = $m-$monthes; $t = date(t,strtotime($res_y.-.$res_m.-01)); if($d0;//$monthes_mod =0或>0或if ($year>0) { if ($monthes_mod>0) { $m_diff = 12+$m-$monthes_mod; $m_diff_div = floor($m_diff/12); $m_diff_mod = $m_diff%12; if ($m_diff_div > 0) { $res_y = $y; $res_m = $m_diff_mod; }elseif ($m_diff_div == 0) { $res_y = $y -1; $res_m = $m_diff_mod; } }elseif ($monthes_mod==0) { //整除 $res_y = $y; $res_m = $m; }}elseif ($year == 0) { $m_diff = 12+$m-$monthes_mod; $m_diff_div = floor($m_diff/12); $m_diff_mod = $m_diff%12; if ($m_diff_div > 0) { $res_y = $y; }elseif ($m_diff_div == 0) { $res_y = $y -1; } $res_m = $m_diff_mod;}$t = date(t,strtotime($res_y.-.$res_m.-01));if($d