AGI php and "GET VARIABLE" issues


I get confuse with the use of my php script (via AGI) with something like the traditionnal

exten => s,1,Agi(my_script.php)

Everything goes right when I launch the script and this script nicely ends with the wanted results.
However, I can’t get a channel variable from within the script. In fact, when I do a “GET VARIABLE MYVARIABLE”, the result I get is :

200 result=1

and that’s all !! No value of variable after the “result=1”, whereas the variable is well set and accessible from the dialpan.

Any idea ? :question:

Thank you