CFLib.org – Common Function Library Project

Description:
Why doesn't CF have a function for checking to see if something is an integer? isNumeric() is all well and good, but sometimes you need an int and you want to check. Well, here's one way to do it.

Return Values:
Returns a Boolean.

Example:

<table border="1">
<cfoutput>
<cfloop list="1,1.4,abc,ab12,12ab,1 2 3,12 abc 34,42" index="var">
<tr>
    <td>#var#</td>
    <td>#YesNoFormat(isInt(var))#</td>
</tr>
</cfloop>
</cfoutput>
</table>

Parameters:

Full UDF Source:

/**
 * Checks to see if a var is an integer.
 * version 1.1 - mod by Raymond Camden
 * 
 * @param varToCheck      Value you want to validate as an integer. 
 * @return Returns a Boolean. 
 * @author Nathan Dintenfass (nathan@changemedia.com) 
 * @version 1.1, April 10, 2002 
 */
function isInt(varToCheck){
  return isNumeric(varToCheck) and round(varToCheck) is vartoCheck;
}