Description:
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If you use the "suffix" parameter if BASENAME, the string is treated as case-sensitive, for example:

$fname = "C:\WINDOWS\AFILE.TXT";
print basename($fname,".TXT");

returns "AFILE"

but

$fname = "C:\WINDOWS\AFILE.TXT";
print basename($fname,".txt");

returns "AFILE.TXT"


Reproduce code:
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$fname = "C:\WINDOWS\AFILE.TXT";
print basename($fname,".txt");


Expected result:
----------------
AFILE

Actual result:
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AFILE.TXT