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PHP日期月份相关

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<?php
class Datefmt{
   function __construct() {}
  /**
   * 根据指定日期获取所在周的起始时间和结束时间
   */
  public function get_weekinfo_by_date($date) {
    $idx = strftime("%u", strtotime($date));     $m - 1;
    $sun_idx = $idx - 7;
    return array(
      'week_start_day' => strftime('%Y-%m-%d', strtotime($date) - $mon_idx * 86400),
      'week_end_day' => strftime('%Y-%m-%d', strtotime($date) - $sun_idx * 86400),
      );
  }
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  /**
   * 根据指定日期获取所在月的起始时间和结束时间
   */
  public function get_monthinfo_by_date($date){
    $ret = array();
    $timestamp = strtotime($date);
    $mdays = date('t', $timestamp);
    return array(
      'month_start_day' => date('Y-m-1', $timestamp),
      'month_end_day' => date('Y-m-'.$mdays, $timestamp)
      );
  }
  /**
   * 获取指定日期之间的各个周
   */
  public function get_weeks($sdate, $edate) {
    $range_arr = array();
    // 检查日期有效性
    $this->check_date(array($sdate, $edate));
    // 计算各个周的起始时间
    do {
      $weekinfo = $this->get_weekinfo_by_date($sdate);
      $end_day = $weekinfo['week_end_day'];
       $start = $this->substr_date($weekinfo['week_start_day']);
      $end = $this->substr_date($weekinfo['week_end_day']);
      $range = "{$start} ~ {$end}";
      $range_arr[] = $range;
       $sdate = date('Y-m-d', strtotime($sdate)+7*86400);
    }while($end_day < $edate);
    return $range_arr;
  }
  /**
  * 获取指定日期之间的各个月
  */
  public function get_months($sdate, $edate) {
    $range_arr = array();
    do {       $m
      $end_day = $monthinfo['month_end_day'];
       $start = $this->substr_date($monthinfo['month_start_day']);
      $end = $this->substr_date($monthinfo['month_end_day']);
      $range = "{$start} ~ {$end}";
      $range_arr[] = $range;
       $sdate = date('Y-m-d', strtotime($sdate.'+1 month'));
    }while($end_day < $edate);
    return $range_arr;
  }
  /**
   * 截取日期中的月份和日
   * @param string $date
   * @return string $date
   */
  public function substr_date($date) {
    if ( ! $date) return FALSE;
    return date('m-d', strtotime($date));
  }
  /**
  * 检查日期的有效性 YYYY-mm-dd
  * @param array $date_arr
  * @return boolean
  */
  public function check_date($date_arr) {
    $invalid_date_arr = array();
    foreach ($date_arr as $row) {
      $timestamp = strtotime($row);
      $standard = date('Y-m-d', $timestamp);
      if ($standard != $row) $invalid_date_arr[] = $row;
    }
    if ( ! empty($invalid_date_arr)) {
      die("invalid date -> ".print_r($invalid_date_arr, TRUE));
    }
  } 
}