how to take the url to became a variable

[eluser]jdfwarrior[/eluser]
modify your adm_testimonials function to accept a parameter (see jedd's post above).

Then replace your redirect function call, with the code I gave you. That will make it run that function (same as going to admpage/adm_testimonials) and you can pass the $data variable to that function. From there you can manipulate it or display whatever you want.