There are many types of variable in ColdFusion framework. First it is necessary to understand scope of the variables -
all variables can be local or global.
all variables are persistent or non-persistent.
all variables can be private or public.
The scope of variable defines its properties & values of a variable. There are many different kind of scope in ColdFusion variables -
Caller - to set or read the variable attributes in a scope.
Arguments - to set or read the arguments that are called by the template.
This - to define the storage of the variables
Request - to request for a defined value. It is by default a public variable.
Client - to set the value in the registry or
database.
Cookies - to set the value on the user machine.
To set a scope for ColdFusion variable is not required. It helps in preventing the confusion to the framework about a variable is being used or not.
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