(PHP 4, PHP 5, PHP 7, PHP 8)
jdmonthname — 返回月份名称
   返回 string 类型的月份名称,mode 
   告诉此函数要将儒略历转化为哪个历法以及哪个类型的月份名称。
   
| 模式 | 含义 | 值 | 
|---|---|---|
CAL_MONTH_GREGORIAN_SHORT | 
       公历 - 缩写 | Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec | 
CAL_MONTH_GREGORIAN_LONG | 
       公历 | January, February, March, April, May, June, July, August, September, October, November, December | 
CAL_MONTH_JULIAN_SHORT | 
       儒略历 - 缩写 | Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec | 
CAL_MONTH_JULIAN_LONG | 
       儒略历 | January, February, March, April, May, June, July, August, September, October, November, December | 
CAL_MONTH_JEWISH | 
       犹太历 | Tishri, Heshvan, Kislev, Tevet, Shevat, Adar, Adar I, Adar II, Nisan, Iyyar, Sivan, Tammuz, Av, Elul | 
CAL_MONTH_FRENCH | 
       法国历 | Vendemiaire, Brumaire, Frimaire, Nivose, Pluviose, Ventose, Germinal, Floreal, Prairial, Messidor, Thermidor, Fructidor, Extra | 
jday用来计算的儒略日
mode历法模式(见上表)。
   指定的儒略日和 mode 的月份的名称。