It can validate and filter data coming from some insecure source, such as user input via filter extension.
This extension is part of PHP Core version 5.20 and above, but you can always install it under Linux.
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.
After all, email offers a highly effective mode of communication, both in terms of Qo S (quality of service) and cost.
Furthermore, it's asynchronous nature offers both parties the freedom of participating at a time most convenient to their time schedule.
Certainly, this should sound very familiar to most Web developers, whether they are setting up their first consciously-coded script or implementing full-blown applications required to handle more complex processes.