User-Friendly Form Validation with PHP and CSS
"What if you want your validation to involve a database lookup? This clearly must take place on the server side. It would be nice if the user could click Submit and have the form return a message that the username is not valid, similar to the example in Figure 1, for valid email formats. A lot of web sites already provide such functionality. Unfortunately, these websites often have the filename extensions .asp or .aspx, and not .php. What a shame. Who says the ASP folks down the street should have all the fun? In this article, I'll show you how you can add such functionality to your PHP forms."
(Submitted by Noel Tue Apr 27, 2004 )
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