[PHP] Newbie question about Class

[Al]

My question seems fundamental.  I want to set a variable in one function 
in a class and then want to use the value in a second function.  
However, the functions are called a html page with two passes.  Submit 
reloads the page and an if(...) calls the second function in the class.

If I declare on the first run:
   $get_data = new edit_tag_file();
   $edit_args= $get_data-> edit_prep();
The on the second pass, I'm stuck.  I can't declare a new instance of 
"edit_tag_data".
And, it appears the object is gone after I leave the page. 

Will the class structure do this for me or must I save the values in 
$GLOBAL or something?

Thanks....

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