PHP Pass variable through URL using ?object=value -

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I know that there is a group of these topics, but all the answers are not working just for me. What I could have achieved, I have tried, and I am still right where I started. I am trying to pass a variable through a URL: 

  & lt; A href = "test2.php? One =" & lt ;? Php echo $ _GET ['one']; ? & Gt; "& Gt; Link & lt; / a & gt;   
 When clicking on the" link ", it redirects me to the appropriate page (test2.php), but leave the empty value (As a result of localhost / test 2.php? One =) means that now I can not see which variable is being sent.  
  $ one = $ _GET ['A']; $ echo;   
 How can I send test2.php from test.php?

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