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how to get the posted value after reloading that page


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Hi,
  I'm new to php.I'm developeing one application using php.i've got problem .Plz help me.


My problem is:
    My application contains one page called [b]modetest.php [/b] ,which contains values user_id(text box),category (combo box) and subcategory (combo box) with submit(button).Once i click submit button the control goes to the page called [b]test.php[/b] where i'm generating questions from database, whis is based on category id,subcategory id that  is based on selected category,subcategory in [b]modetest.php[/b] page. for that i posted the values of selected category,subcategory and user name from [b]modetest.php[/b] to [b]test.php[/b] using "$_POST".
      For the first i'm getting the questions based on selected category and subcategory.Once i relode the page using "NEXT" button i'm not getting values of same selected category and subcategory.So i could not generate the question.
    what i've to do to get the values of selected category and subcategory after reloading my page using "NEXT" button.
   


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