BC (Arbitrary Precision) Functions
函数bcadd()
描述：
Add two arbitrary precision numbers
string bcadd (string left operand, string right operand, int [ scale ]); 左面的字符加右面的字符，返回一个字符。
函数bccomp()
描述：
int bccomp (string left operand, string right operand, int [ scale ]);
左面的字符和右面的字符进行比较，如果相等的话返回0，如果左面的比右面的长返回+1，右面的比左面的长返回-1
函数bcdiv()
描述：
Divide two arbitrary precision numbers
string bcdiv (string left operand, string right operand, int [ scale ]); 将左面的字符串以右面的字符串为标准分开
函数bcmod()
描述：
Get modulus of an arbitrary precision number
string bcmod (string left operand, string modulus);
用右面的modulus操作左面的字符串
函数bcmul()
描述：
Multiply two arbitrary precision number
string bcmul (string left operand, string right operand, int [ scale ]);
Multiply the left operand by the right operand and returns the result. The optional scale sets the number of digits
after the decimal place in the result.
函数bcpow()
描述：
Raise an arbitrary precision number to another.
Raise x to the power y . The scale can be used to set the number of digits after the decimal place in the result.
函数bcscale()
描述：
Set default scale parameter for all bc math functions.
string bcscale (int scale);
This function sets the default scale parameter for all subsequent bc math functions that do not explicitly specify a scale
parameter
函数bcsqrt()
描述；
string bcsqrt (string operand, int scale);
返回字符的平方根
函数bcsub()
描述：
string bcsub (string left operand, string right operand, int [ scale ]);
将右面的字符减去左面的字符
Calendar Functions日历功能
函数JDToGregorian()
描述：
string jdtogregorian (int julianday);
将Julian日历转换成Gregorian日历
函数GregorianToJD()
描述：
int gregoriantojd (int month, int day, int year);
将Gregorian日历转换成Julian日历
函数JDToJulian ()
描述：
string jdtojulian (int julianday);
将Julian Calendar转换Julian Day
函数JulianToJD ()
描述：
int juliantojd (int month, int day, int year);
函数JDToJewish ()
描述：
Converts a Julian Day Count to the Jewish Calendar
string jdtojewish (int julianday);
函数JewishToJD()
描述：
Converts a date in the Jewish Calendar to Julian Day Count
int jewishtojd (int month, int day, int year);
函数JDToFrench()
描述：
Converts a Julian Day Count to the French Republican Calendar
string jdtofrench (int month, int day, int year);
函数FrenchToJD()
描述：
Converts a date from the French Republican Calendar to a Julian Day Count int frenchtojd (int month, int day, int year);
函数JDMonthName ()
描述：
Returns a month name
string jdmonthname (int julianday, int mode);
Mode Meaning
0 Gregorian - apreviated
1 Gregorian
2 Julian - apreviated
3 Julian
4 Jewish
5 French Republican
函数JDDayOfWeek ()
描述：
Returns the day of the week
mixed jddayofweek (int julianday, int mode);
Mode Meaning
0 returns the day number as an int (0=sunday, 1=monday, etc)
1 returns string containing the day of week (english-gregorian)
2 returns a string containing the abreviated day of week (english-gregorian