Another helper function for ColdFusion, this one to replicate PHP's array_merge which allows you to merge multiple arrays. In this case I'm only concerned with associative arrays, which ColdFusion calls structs.

CFMX provides StructAppend which will merge two (and only two) structures, optionally overwriting keys. I always want to overwrite keys, and I want to merge unlimited structures.

<cfscript>
function struct_merge() {
	var base = {};
	var i = 1;
 
	for( i = 1; i LTE ArrayLen(arguments); i=i+1 ) {
		if( IsStruct(arguments[i]) ) {
			StructAppend(base, arguments[i], true);
		}
	}
	return base;
}
</cfscript>

Usage

<cfscript>
one = {
	a = "a",
	b = "b",
	c = "c",
	d = "d",
	e = "e"
};
 
two = {
	1 = "one",
	2 = "two",
	3 = "three",
	4 = "four",
	a = "one_SetByTwo",
	c = "three_SetByTwo"
};
 
three = {
	a = "one_SetByThree",
	2 = "b_SetByThree"
};
 
new = struct_merge(one, two, three);
</cfscript>
<cfdump var=#new#>

Result:

Tags: Code, ColdFusion, Development, PHP

Posted on Thursday, May 8th, 2008 at 1:06 pm | Filed under Development
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