coldfusion Variables Using cfparam
Example
The <cfparam> tag creates a variable if it does not already exist. You can assign a default value using the default attribute. This can be used if you want to create a variable, but don't want to overwrite it if it has been previously created elsewhere.
Here the variable hasn't been set previously, so it will be assigned with the <cfparam> tag.
<cfparam name="firstName" default="Justin">
<cfoutput>
Hello #firstName#
</cfoutput>
Here the variable has already been assigned using the <cfset> tag, so this value will override the default value in the <cfparam> tag.
<cfset firstname="Justin">
<cfparam name="firstName" default="Barney">
<cfoutput>
Hello #firstName#
</cfoutput>
