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if ( eregi("MSIE", getenv( "HTTP_USER_AGENT" ) ) || eregi("Internet Explorer", getenv("HTTP_USER_AGENT" ) ) ) {
  // do something
}

Guy says:
02/15/2010 at 12:08 pm
Have a quick maybe stupid question. I need to detect all IE versions lower then 8. Can this just be done using the checks for if it’s ie 6 / 7 or is there an easier way
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- jayclimbs says:
  03/26/2010 at 4:18 pm
  Browsers send their ID in a header file; I’m not sure if IE 8 sends anything unique from previous versions, but if you look at the header of it compared to other versions, you may find a useable text-string.
  Make a script that echoes HTTP_USER_AGENT, find some folks who have earlier versions, have them send you the result, and see if any text string fits the bill.
  Keep in mind, you may also want to differentiate between IEPC and IEMac.
  I once used a switch statement with several browser options such as this snippet, and fed different CSS stylesheets to the output, depending on which browser was requesting a page. I didn’t parse between versions, however.
Adam Haskell says:
04/12/2010 at 10:09 am
Important note: Some non-ie browsers include the substring MSIE in them. Namely Opera.
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