Contents > Developing ColdFusion MX Applications > Elements of CFML > Variables

Variables

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.

ColdFusion has a number of built-in variables that provide information about the server and are returned by ColdFusion tags. For a list of the ColdFusion built-in variables, see Reserved Words and Variables in CFML Reference.

The following two characteristics classify a variable:

• The scope of the variable, which indicates where the information is available and how long the variable persists
• The data type of the variable's value, which indicates the kind of information a variable represents, such as number, string, or date

The following section lists and briefly describes the variable scopes. Data types lists data types (which also apply to constant values). For detailed information on ColdFusion variables, including data types, scopes, and their use, see Using ColdFusion Variables.

Contents > Developing ColdFusion MX Applications > Elements of CFML > Variables

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