The third topic is the new-to-PHP 5 PECL library called Filter.Its usage isn't very programmer-friendly, but the way it wraps all of the customary data filtering and sanitizing methods into one interface makes it worth knowing.The full source code for this class can be viewed here.This option can be used to attach arbitrary domain-specific data to a constraint.Hopefully this tutorial has demonstrated how easily this can be done by using functions defined within a date class.
In PHP4 the name of the constructor is the same as the class name.The query need not use a database; that is, SQL can be used as a simple calculator.This approach is perhaps less desirable than the approach we have described, because there is no database activity involved in our example, and database activity adds unnecessary overhead."and the day is valid for that month."; elseif (intval($parts) , and no further checks of the date are made. The fifth and final check tests if the user is 18 years of age or older.There are many ways to do this, with perhaps the most obvious being finding the difference between the date of birth and the current date using library functions, and checking that this difference is more than 18 years.