In the php database, what type is the additional temperature (°c) field displayed on the page = what settings are needed?

In the php database, what is the type of the temperature Celsius field added? displayed on the page = What are the settings required? php & nbsp; what is the field type of the temperature Celsius field added to the database table? & nbsp; when the page is displayed at °c (for example,-1 ℃ ~ 8 ℃) do you need any settings? isn't it a character ?, When you use int storage, you can add the temperature "°c" and "php" to the database. What type of "°c" field is displayed on the page? = what settings are needed?
Php adds a field of temperature degree Celsius to the database table. what is the field type? when the field type is displayed on the page, such as-1 degree Celsius ~ 8 ℃) do you need any settings?
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Cannot it be a character?
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You can use int to store
Add ℃ to the display.
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If the field content contains "℃", The varchar type is used.
Otherwise, both int and varchar can be used.

°C is only a character.
$ A =-1;
$ B = 8;
Echo "{$ a} ℃ ~ {$ B} ℃ ";