Validating email address with php
Nonetheless, to be sure there are times when the provision of a valid email address is an absolute necessity, not only for the site operator but also for the user.For example, it is often in the interests of both parties that a confirmation email is sent to a specific address whenever goods are purchased from the site.How many times have you heard of email being termed "the ultimate killer application"?Indeed, the impact that it has made on all of our lives in such a short period of time is immeasurable.Or you want to send them some "information from carefully screened third parties with whom we maintain a strategic relationship." Or maybe you want something in return before you give them that valuable whitepaper that you spent two months completing. You get the idea — users are registering with bogus email addresses at domains that don’t even exist.Whatever the reason, you happily construct your registration page, set up a database table to track the incoming email addresses, and publish it live. Not only are you going to be sending mail to nonexistent addresses, but they clutter up your database and cause maintenance headaches because they need to be cleaned out.
Whatever the case, validating a visitor’s email address to see if it belongs to a real domain is always a good step to help you avoid, at least partially, several possible problems that arise when applications are receiving incoming bogus data.
Getting email addresses you collect — for a newsletter, say, or for password retrieval — to at least conform to standards (if not ensure ) is crucial, of course, and extremely tricky.
If you want to avoid these, you can test for top-level domains that are more than 4 characters long (which will erroneously throw out ".museum"), or for domain names that are either 2 characters long (all the country top-level domains) or one of the known top-level domains (which you will have to update as the list changes).
Many applications in the field of Web development need to validate email addresses.
While this can be done in a variety of ways, one simple but effective way involves writing your own functions in PHP. Within the huge and fascinating field of Web development, one of the most common tasks that many applications have to deal with is, undoubtedly, verifying whether a user email address is valid.
Given such qualities, it isn't a surprise that email has become a defacto tool of business for communicating with its clientele.