And you must remember that some concrete internet servers can fail some details of common standard and in fact work with own "modified standard". There are lot of servers which works not by standards or not by FRESH standards. If you type some regexp once, and validate only by that, you have no guarantee that it will stay right in future and your future users will not fail with their "new-way" emails. Also, once more I notice, that not all email-serving severs works strictly accordingly to common and modern standard of email adresses. Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site (the association bonus does not count).
So, my position is the same: main point if you want to verify email address - just send activation [email protected], well, for example, there's an concrete version of PHP on your server and you can't update it to newest. Would you like to answer one of these unanswered questions instead?
This is just a simple and harmless example how the PHP_SELF variable can be exploited.
Be aware of that any Java Script code can be added inside the - this would not be executed, because it would be saved as HTML escaped code, like this: <script>location.href(' The code is now safe to be displayed on a page or inside an e-mail.
But you must accept the address "[email protected]" if user really want it. But you have old function on server, you cant update in some cases.
Also, you must remember that email address standard was and can evolute, so you can't just type some "standard-valid" regexp once and for all times. Just say me please, according what RFC the server assumes that [email protected] [email protected] the same address? And you will loose clients with some new valid emails.
If it has not been submitted, skip the validation and display a blank form.
However, in the example above, all input fields are optional.
Here we bring up in front of you the PHP contact form with validation feature.
In our previous blogs, we have applied Java Script and // Initialize variables to null.
I'm not sure about 5.3.4 final, but it is written that some 5.3.4-snapshot versions also were affected.