Description:
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I am attempting to break up a string of initials in order to add periods after each letter. Ex, AMA becomes A.M.A.   I'm using str_split to generate an array, which I then glue together with periods. 

The problem is when I have a certain UTF8 character in the string: "ŞZ". str_split appears to not like the UTF8 encoding of the first letter. I've added some debug output in the code snippet below.  

Test script:
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	$str_initials = "ŞZ";

	echo "<p><b>\$str_initials</b> $str_initials<p>";
	
	$arr_initials 	= str_split($str_initials);
	print_r($arr_initials);
	echo "<p>";
	foreach ($arr_initials as $initial)
	{
		echo "<b>\$initial</b> $initial<br>";
		$arr_ni[] = $initial . '.';
	}
	$str_initials = implode($arr_ni);

	echo "<p><b>\$str_initials</b> $str_initials";

Expected result:
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ŞZ becomes Ş.Z.

Actual result:
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ŞZ becomes �.�.Z.