PHP Global Variable throught pages -

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I am using jquery during a php project, so all the pages dynamically load into the main page , I'm trying to create links only for a certain user, so if they go to the main page and add the URL, that is? Mode = 55rt67 It gets stored as a variable and can be checked in the entire app I am using below, but it does not work. Any suggestions? 

  if (empty ($ _ GET)) {$ mode = "user"; } {Define ('$ mode', '($ _GET [' mode '])}}    
 
 
  defined  is used to declare constants, you want to use a variable, not one constant.  
 Updated (session mode Use session to use): $ {$ _SESSION ['mode'] = "user";} and {$ _SESSION ['mode'] = $ _GET ['mode']:  session_start  on each page

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