 PHP3 手冊
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int checkdate
(int month, int day, int year);
Returns true if the date given is valid; otherwise returns false. Checks the validity of the date formed by the arguments. A date is considered valid if:
year is between 1900 and 32767 inclusive
month is between 1 and 12 inclusive
day is within the allowed number of days for the given month. Leap years are taken into consideration.