Description:
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Non alphanumeric characters are influencing the functionality of strtolower and ucwords. When a character in the example is right after a parenthesis, that character is not seen as the first in the word, and hence is not capitalized. This was reported and dismissed earlier, however, I feel that this is something that needs to be looked at, since common sense tells us that any non-alphanumeric character cannot be capitilized.

Reproduce code:
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$foo = "Krung Thep (Bangkok)";
$bar = ucwords(strtolower($foo));

echo $foo;

Expected result:
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Krung Thep (Bangkok)

Actual result:
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Krung Thep (bangkok)