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I have a string that is one of the following forms
ABC // all caps:
// not necessarily "ABC", could be any combination of capital letters
Abc // first letter capitalized, rest are lowercase
abc // all lowercase
and I need to distinguish which of these three cases it is… what’s the best way to do this? There doesn’t seem to be an islower() or isupper() function; I suppose I could make one using strtoupper() or strtolower().
ctype_lower, ctype_upper
http://www.php.net/manual/en/ref.ctype.php