Which browsers supply HTTP_REFERER?

[mp96brbj]

I read in the manual that HTTP_REFERER is sent by the browser, and that all browsers do not send this. I'm considering requring HTTP_REFERER to validate forms, so no-one can submit info to my scripts from other servers than my own.

Does anyone know which browsers do or do not supply HTTP_REFERER?

[frymaster]

although this doesn't really address your question, a good command to investigate is get_browser(). it's "hidden" in the "miscellaneous" functions section of the php manual, so a lot of folks miss it!
check out:
http://www.php.net/manual/en/function.get-browser.php