PHP keyword Global, what is the function

What is the role of PHP keyword global?

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Http://www.baidu.com/s?tn=sogouie_dg&ie=utf-8&bs=PHP%E5%85%B3%E9%94%AE%E5%AD%97GLOBAL&f=8&rsv_ bp=1&wd=php+global&rsv_sug3=1&rsv_sug1=1&rsv_sug4=49&inputt=352

This is clearer than I said.
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Simply put, the variable has its scope, that is, you declare a variable, does not mean that you can use it anywhere, imagine that you are in a small black room and no doors and windows, your friends outside the house, but in the dark room you can not directly talk with friends, because you do not see your friends, Now that you've used your smartphone and friends video to communicate, you can talk to your friends directly, so global is the role of the smartphone in this example.

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