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I am using $_SERVER['HTTP_USER_AGENT'] to record the user's browser and operating system in use after he logs in my website, when I echo this it shows me these

Firefox

Mozilla/5.0 (Windows NT 6.1; rv:10.0.2) Gecko/20100101 Firefox/10.0.2

Chrome

Mozilla/5.0 (Windows NT 6.1) AppleWebKit/535.19 (KHTML, like Gecko) Chrome/18.0.1025.162 Safari/535.19

Safari

Mozilla/5.0 (Windows NT 6.1) AppleWebKit/534.50 (KHTML, like Gecko) Version/5.1 Safari/534.50

Opera

Opera/9.80 (Windows NT 6.1; U; en) Presto/2.9.168 Version/11.50

IE

Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0)

I'm interested to know why Mozilla/5.0 is prefixed when I echo it in IE, Safari And Chrome?

Uberfuzzy
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