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I haven't found any info on php-gtk widgets being embedded to HTML. This was actually the first thing I expected when I first encountered the term "php-gtk2".
Anyway, is there any thing out there going towards this directions? Create interactive widgets on browser with php-gtk2?
Since when used in web programming, PHP is server side, it is unable to be used for anything interactive that is embedded on the client side. For that to happen, it would have to be like Java, where a plugin was available.
For what you want, AJAX, Flash, or Java applets would suit you well.