根据日期获取星座

get_constellation.php

// $birthday的格式为yyyy-mm-dd
  public function getConstellation($birthday, $format=null)
  {
    $pattern = '/^\d{4}-\d{1,2}-\d{1,2}$/';
    if (!preg_match($pattern, $birthday, $matchs))
    {
      return null;
    }
  
    $date = explode('-', $birthday);
    $year = $date[0];
    $month = $date[1];
    $day = $date[2];
  
    if ($month <1 || $month>12 || $day < 1 || $day >31)
    {
      return null;
    }
  
    // 设定星座数组
    $constellations = array(
        '摩羯座', '水瓶座', '双鱼座', '白羊座', '金牛座', '双子座',
        '巨蟹座','狮子座', '处女座', '天秤座', '天蝎座', '射手座',);
    // 或 ‍‍$constellations = array('Capricorn', 'Aquarius', 'Pisces', 'Aries', 'Taurus', 'Gemini', 'Cancer','Leo', 'Virgo', 'Libra', 'Scorpio', 'Sagittarius',);
  
    //设定星座结束日期的数组，用于判断
    $enddays = array(19, 18, 20, 20, 20, 21, 22, 22, 22, 22, 21, 21,);
  
    //如果参数format被设置，则返回值采用format提供的数组，否则使用默认的数组
    if ($format != null)
    {
      $values = $format;
    }
    else
    {
      $values = $constellations;
    }
    
    //根据月份和日期判断星座
    switch ($month)
    {
      case 1:
        if ($day <= $enddays[0])
        {
          $constellation = $values[0];
        }
        else
        {
          $constellation = $values[1];
        }
        break;
      case 2:
        if ($day <= $enddays[1])
        {
          $constellation = $values[1];
        }
        else
        {
          $constellation = $values[2];
        }
        break;
      case 3:
        if ($day <= $enddays[2])
        {
          $constellation = $values[2];
        }
        else
        {
          $constellation = $values[3];
        }
        break;
      case 4:
        if ($day <= $enddays[3])
        {
          $constellation = $values[3];
        }
        else
        {
          $constellation = $values[4];
        }
        break;
      case 5:
        if ($day <= $enddays[4])
        {
          $constellation = $values[4];
        }
        else
        {
          $constellation = $values[5];
        }
        break;
      case 6:
        if ($day <= $enddays[5])
        {
          $constellation = $values[5];
        }
        else
        {
          $constellation = $values[6];
        }
        break;
      case 7:
        if ($day <= $enddays[6])
        {
          $constellation = $values[6];
        }
        else
        {
          $constellation = $values[7];
        }
        break;
      case 8:
        if ($day <= $enddays[7])
        {
          $constellation = $values[7];
        }
        else
        {
          $constellation = $values[8];
        }
        break;
      case 9:
        if ($day <= $enddays[8])
        {
          $constellation = $values[8];
        }
        else
        {
          $constellation = $values[9];
        }
        break;
      case 10:
        if ($day <= $enddays[9])
        {
          $constellation = $values[9];
        }
        else
        {
          $constellation = $values[10];
        }
        break;
      case 11:
        if ($day <= $enddays[10])
        {
          $constellation = $values[10];
        }
        else
        {
          $constellation = $values[11];
        }
        break;
      case 12:
        if ($day <= $enddays[11])
        {
          $constellation = $values[11];
        }
        else
        {
          $constellation = $values[0];
        }
        break;
    }
    return $constellation;
  }