php session problem -

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I think this code should be "first" echo in the first experiment and after refreshing it should be timestamp echo, But it will show first 

  if (isset ($ _ session ['test session']) {echo ($ _SESSION ['TestSession']);} Else {resonant "before"; $ _SESSION ['Test session'] = time ();}    
 
 
 have you kept < / P> 
  session_start ();   
 at the top of your page?

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