CF creating spurious variables

This is the result without query-string or when the query-string is ?bung=false.

My ColdFusion build: 9.0.1.274733.

Message was edited by: BKBK

Now with query-string ?bung=true

Peculair find, indeed. A Google search revealed just one instance of the term IMPLICITARRYSTRUCTVAR0 on the web.

Clearly a bug. I have been able to reproduce it -- always! (Note, however, my CF version above.)

I have learned something new from this exercise. I never realized until now that <cfloop item="myKey" collection="#myCollection#"> adds myKey to the variables scope!

The IMPLICITARRYSTRUCTVAR0 never occurs when you use this code:

<cfset st.foo1 = "foo1">
<cfset st.foo2 = "foo2">
<cfloop item="sKey" collection="#variables#">
    Key:<cfoutput>#sKey#</cfoutput><br>
  <cfdump var="#variables#">
<hr />
</cfloop>

The IMPLICITARRYSTRUCTVAR0 never occurs when you use this code:

<cfset st = {foo1 = "foo1", foo2 = "foo2"}> 
<cfloop item="sKey" collection="#st#">
  <cfdump var="#variables#">
<hr />
</cfloop>

However, the IMPLICITARRYSTRUCTVAR0 always occurs when you use this code:

<cfset st = {foo1 = "foo1", foo2 = "foo2"}> 
<cfloop item="sKey" collection="#variables#">
  <cfdump var="#variables#">
<hr />
</cfloop>

Apparently, when you use the new curly-bracket notation for structs and you loop through the variables structure, ColdFusion adds the extra key IMPLICITARRYSTRUCTVAR0 to the variables structure.

Adam Cameron. wrote:

 

Oh yeah, forgot to say. I don't think it's anything to do with the loop, per se.  I'm on a train to the pub to watch England v France (Six Nations), so cannae check, but you should just be able to do this:

 

st = {};

writeOutput(structKeyExists(variables, "___IMPLICITARRYSTRUCTVAR0");

 

Say what? Computer says yes! Nice counterexample!

Gets me thinking perhaps Javaman forgot to take out the placeholder for index 0 after the design phase. The code

<cfset st = {}>
<cfoutput>
structKeyList(variables): #structKeyList(variables)#<br>
isDefined("variables.___IMPLICITARRYSTRUCTVAR0"): #isDefined("variables.___IMPLICITARRYSTRUCTVAR0")#
</cfoutput>

gives the result

structKeyList(variables):  ___IMPLICITARRYSTRUCTVAR0,ST
isDefined("variables.___IMPLICITARRYSTRUCTVAR0"):  YES

But then again, the variable ___IMPLICITARRYSTRUCTVAR0 is nowhere to be found in <cfdump var="#variables#">