Using ColdFusion Variables

Macromedia ColdFusion variables are the most frequently used operands in ColdFusion expressions. Variable values can be set and reset, and can be passed as attributes to CFML tags. Variables can be passed as parameters to functions, and can replace most constants.

This chapter describes how to create and use ColdFusion variables. It includes the following information:

• How variables can represent different types of data
• How the data types get converted
• How variables exist in different scopes
• How the scopes are used
• How to use variables correctly

Contents

Creating variables

Variable characteristics

Data types

Using periods in variable references

Data type conversion

About scopes

Ensuring variable existence

Validating data

Passing variables to custom tags and UDFs

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