Description:
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I am trying to use the mb_convert_case() function. When the php page is run, I receive a fatal error which says that I am calling an undefined function. I referred to your page about this function in the PHP manual (http://us2.php.net/manual/en/function.mb-convert-case.php). I even created a separate page called casetest.php in which the only php code is the example about "Mary had a little lamb" copied and pasted from the function's manual page referred to above. I still receive the same error. In the situation I just described, I am running PHP 5.0.0 installed by WinLAMP on Apache.

Next, even after uploading to a webhost (cjb.cc) that uses PHP 4.3.9 on a Linux server, I still receive the error. (If you'd like to see it: http://hellonull.cjb.cc/casetest.php) I've included the phpinfo function on that page to provide information that may be necessary to assess the problem.

Reproduce code:
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<?php
phpinfo();
echo "<br><br>";
$str = "mary had a Little lamb and she loved it so";
$str = mb_convert_case($str, MB_CASE_UPPER, "UTF-8");
echo $str; // Prints MARY HAD A LITTLE LAMB AND SHE LOVED IT SO
$str = mb_convert_case($str, MB_CASE_TITLE, "UTF-8");
echo $str; // Prints Mary Had A Little Lamb And She Loved It So
?> 

Expected result:
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Apart from the result of phpinfo, I expected to see "Mary Had A Little Lamb And She Loved It So".

Actual result:
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After the phpinfo results:

Fatal error: Call to undefined function: mb_convert_case() in /home/vhosts/hellonull.cjb.cc/casetest.php on line 5