What are the potential issues that may arise when storing temperature values with units, such as °C or °F, in a database using PHP?

One potential issue that may arise when storing temperature values with units in a database using PHP is the inconsistency in unit representation, which can lead to errors in calculations or comparisons. To solve this issue, it is recommended to store temperatures in a standardized unit, such as Celsius, and convert them to other units when needed for display.

// Store temperature values in Celsius in the database
$temperature_celsius = 25;

// Convert Celsius to Fahrenheit for display
$temperature_fahrenheit = ($temperature_celsius * 9/5) + 32;
echo $temperature_fahrenheit . " °F";