Help with PHP values

Hi! Can someone tell my what are the best values for the PHP Settings. I did some modifications long time ago because I was uploading a high amount of data to the server, but I would like to take all back to the normality.

max_execution_time 3000
max_input_time 6000
max_input_vars 20000
memory_limit 512 M
post_max_size 128 M
upload_max_filesize 128 M
zlib.output_compression ON