根据给定的日期格式'YYYY-mm-dd',获取该日期所在周的起始日期
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2024-01-17 20:00:10
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php代码
/** * 获取一年中所有星期的起始日期 * @param $year 格式 'YYYY' * 返回二维数组 下标 key1值对应一年中某一天所在周的实际年份 key2值对应一年中某一天所在的周数[一年中第几周] * 返回false 日期格式错误 */ function get_all_weeks($year){ $week_arr = array(); $year = intval(trim($year)); $preg = "/^\d{4,}$/"; if(!preg_match($preg, $year)){ return false; } $begin_day = $year . '-01-01'; $end_day = $year . '-12-31'; //一年第一个星期一 if(date('w',strtotime($begin_day))!=1){ $begin_day = date('Y-m-d',strtotime("next monday", strtotime($begin_day))); } //第一个星期一所在周数 $begin_week_num = intval(date('W',strtotime($begin_day))); //一年最后一个星期天 if(date('w',strtotime($end_day))!=0){ $end_day = date('Y-m-d',strtotime("last sunday",strtotime($end_day))); //存在跨年的星期,跨年所在周星期一 $end_day_next = date('Y-m-d',strtotime($end_day)+24*60*60); //跨年星期所属年份与所在周数 $stride_year = date('o',strtotime($end_day_next)); $stride_weeknum = intval(date('W',strtotime($end_day_next))); } //最后一个星期天所在周数 $end_week_num = intval(date('W',strtotime($end_day))); //一年第一个周一为一年的第一周或者第二周 if($begin_week_num!=1){ $i=2; }else{ $i=1; } $j = 0; for($i;$i<=$end_week_num;$i++){ $start_date = date("Y-m-d", strtotime("$begin_day $j week")); $end_day = date("Y-m-d", strtotime($start_date . '+6 day')); $week_arr[$year][$i] = array( $start_date, $end_day ); $j++; } if($end_day_next){ $week_arr[$stride_year][$stride_weeknum] = array( $end_day_next, date("Y-m-d", strtotime($end_day_next . '+6 day')) ); } return $week_arr; } //demo_调用 /* $year = '2013'; if(get_all_weeks($year)){ var_dump(get_all_weeks($year)); }else{ echo '日期格式出错'; } */ /** * 获取某一天所在周的起始日期 * 依赖 function get_all_weeks * @param $day 格式:'YYYY-mm-dd' * 返回false 日期格式错误 * 正确,返回json "{"begin_day":"YYYY-mm-dd","end_day":"YYYY-mm-dd"}" */ function get_day_week($day){ $date_arr = explode('-', trim($day)); if(!checkdate(intval($date_arr[1]), intval($date_arr[2]), intval($date_arr[0]))){ return false; } $year = date('Y',strtotime($day)); $weeks = get_all_weeks($year); //某一天所属的年份与周数 $real_year = date('o',strtotime($day)); $week_num = intval(date('W',strtotime($day))); if(!empty($weeks[$real_year][$week_num][0])) $begin_day = $weeks[$real_year][$week_num][0]; if(!empty($weeks[$real_year][$week_num][1])) $end_day = $weeks[$real_year][$week_num][1]; //跨年周数值存储于上一年中 if(empty($begin_day)||empty($end_day)){ $year = date('Y',strtotime($day))-1; $weeks = get_all_weeks($year); $real_year = date('o',strtotime($day)); $week_num = intval(date('W',strtotime($day))); if(!empty($weeks[$real_year][$week_num][0])) $begin_day = $weeks[$real_year][$week_num][0]; if(!empty($weeks[$real_year][$week_num][1])) $end_day = $weeks[$real_year][$week_num][1]; } $the_day = array( 'begin_day' => $begin_day, 'end_day' => $end_day ); $the_day = json_encode($the_day); return $the_day; } //demo_调用 /* $day = '2014-01-01'; if(get_day_week($day)){ var_dump(get_day_week($day)); }else{ echo '日期格式出错'; } */