PHP and MySQL Web Development 4th Ed-tqw-_darksiderg

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To give you a taste for these functions, consider the prototypes for the functions you
would use to convert from the Gregorian calendar to the Julian calendar:
int gregoriantojd (int month, int day, int year)
string jdtojulian(int julianday)
To convert a date, you would need to call both of these functions:
$jd = gregoriantojd (9, 18, 1582);
echo jdtojulian($jd);
This call echoes the Julian date in a MM/DD/YYYY format.
Variations of these functions exist for converting between the Gregorian, Julian,
French, and Jewish calendars and Unix timestamps.
Further Reading
If you would like to read more about date and time functions in PHP and MySQL, you
can consult the relevant sections of the manuals at http://php.net/manual/en/ref.
datetime.php and http://dev.mysql.com/doc/refman/5.0/en/date-and-timefunctions.html.
If you are converting between calendars, try the manual page for PHP’s calendar
functions: http://php.net/manual/en/ref.calendar.php.
Next
One of the unique and useful things you can do with PHP is create images on the fly.
Chapter 22,“Generating Images,” discusses how to use the image library functions to
achieve some interesting and useful effects.