php multi language session -

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I am trying for several hours but I can not understand it. I am trying to create a multi language site, and I have a form of changing language. Every time I change language, I need to reload the page twice to see results. Site structure is similar:

1: General. Php checks that the user is logged in, and store the language in a session variable 

  if ($ count = = 1) {while receiving ($ line = $ result-> gt; (PDO :: FETCH_ASSOC)) {$ _SESSION ['language'] = $ line ['language']; }}

2: Includes every page header.fp which will run the Set Language function setLanguage ($ _ session ['language'])

In general it is. Php 

  function set language ($ LAN) {if ($ lan == "english") {included ("languages ​​/ napp"); } Otherwise ($ lane == "tra_chinese") {included ("languages ​​/ tra_chinese.php"); } Other (Include ("Languages ​​/ NAPP"); 3}: change.php is a page that includes a form to change language.  
  if (! ($ _ POST )) {$ Sql ​​= "Set user update language` = ': language where' username '= = id =' $ result = $ db-> ready ($ sql); $ result- & gt; (Array (': language' = & gt; $ _ POST ['language'], ': id' = & gt; $ id)); $ _SESSION ['language'] = $ _POST ['language']; setLanguage ($ _ Session ['language']);} 
 
 
 It appears that I first Nguage.change can change when i change language.change Can someone teach me this how to fix this? Thanks!


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