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Hi, thanks a lot for your reply, I’ve followed the forum and i am been able to draw a chart with only one value.
I want to draw two values in the same chart, I am going to explain my files.

I have a data base with many values:

Data base

I want to draw the 2 temperature values in y axis and the hour in x axis.

If I do only the chart with one value it works, but i don’t know how to draw the second value in html file:

html file

php file

chart

Anybody could help me?

Thanks a lot.