What is the potential issue with the way the value_cpu variable is being updated in the script?

The potential issue with the way the value_cpu variable is being updated in the script is that it is not being incremented correctly. The current code is simply assigning the result of the calculation to the variable, which will overwrite the previous value instead of accumulating the total CPU value. To solve this issue, the value_cpu variable should be updated by adding the result of the calculation each time.

// Incorrect way of updating value_cpu variable
$value_cpu = $cpu_percent;

// Correct way of updating value_cpu variable
$value_cpu += $cpu_percent;