variables - Simple PHP url Help needed -

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I'm new to php, I need some help

.php

I think that when a person will automatically add that page to a number or at the end of any URL 

  like www.abc.com/index.php - - & Gt; Www.abc.com/index.php?abc or? 132

Whenever that index page is refreshed, it should finally get any number or any variable

Try it out: 

  & lt ;? Php if (! Isset ($ _GET ["123"]) {header ("location:" $ _SERVER ["PHP_SELF"]. "? 123"); }

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