Checks the validity of the date formed by the arguments. A date is considered valid if each parameter is properly defined.
The month is between 1 and 12 inclusive.
The day is within the allowed number of days for the given month. Leap years are taken into consideration.
The year is between 1 and 32767 inclusive.
var_dump(checkdate(12, 31, 2000));
var_dump(checkdate(2, 29, 2001));
The above example will output: