strlower problem

[Ed Curtis <e_curtis@xxxxxxxxxxxxx>]

I'm converting upper case characters in a string to lower case and am 
coming up with an empty string.

As I've done a million times before with other non-numerical strings.

$thisStr = "CL22";

$strLow = strtolower($thisStr);

echo $thisStr;

Why does $strLow come up empty?

Thanks,

Ed



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