logging a structure

Ah, $Arr[0] is an array?

I, for some stupid reason, assumed it was an object.

In that case $Arr[0]['Task_0'] should work, but probably best if you check what format and structure your array is with var_dump function.

Also noticed you have few extra . in the code right after -> that's probably why the code doesn't run. And you would need to use same method for all elements, not just for percent.