Ideally, the code snippet shared above should loop through the variable user values in the $users array. As we are not knowing the exact length of the $users array, can you kindly create a sample project reproducing the issue you are facing and share it with us over Google-Drive or Onedrive so that we can run the sample locally at our end to understand the scenario better and help you out?
You can also refer to this gallery page for an example on creating a chart using data from the database in PHP.
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Shashi Ranjan
Team CanvasJS