MACROMEDIA ColdFusion MX, Develop Manual

Page: 51 / 860

Reserved words 51
The output looks like this:
We all said "For He's a jolly good fellow."
Then we said "For She's a jolly good fellow."
Here is a pound sign: #
Reserved words
As with any programming tool, you cannot use just any word or name for ColdFusion variables,
UDFs and custom tags. You must avoid using any name that can be confused with a ColdFusion
element. In some cases, if you use a word that ColdFusion uses—for example, a built-in structure
name—you can overwrite the ColdFusion data.
The following list indicates words you must not use for ColdFusion variables, user-defined
function names, or custom tag names. While some of these words can be used safely in some
situations, you can prevent errors by avoiding them entirely. For a complete list of reserved words,
see
CFML Reference .
•
Built-in function names, such as Now or Hash
•
Scope names, such as Form or Session
•
Any name starting with cf. However, when you call a CFML custom tag directly, you prefix the
custom tag page name with cf_.
•
Operators, such as NE or IS
•
The names of any built-in data structures, such as Error or File
•
The names of any built-in variables, such as RecordCount or CGI variable names
•
CFScript language element names such as for, default, or continue
You must also not create form field names ending in any of the following, except to specify a form
field validation rule using a hidden form field name. (For more information on form field
validation, see
Chapter 26, “Validating form field data types,” on page 579 .)
•
_integer
•
_float
•
_range
•
_date
•
_time
•
_eurodate
Remember that ColdFusion is not case-sensitive. For example, all of the following are reserved
words: IS, Is, iS, and is.