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	* Split a UTF-8 string into an array of characters. Combining characters are			* Split a UTF-8 string into an array of characters. Combining characters are
	* also split.			* also split.
	*			*
	* @param string A valid utf-8 string.			* @param string A valid utf-8 string.
	* @param int\|null Stop processing after examining this many bytes.			* @param int\|null Stop processing after examining this many bytes.
	* @return list A list of characters in the string.			* @return list A list of characters in the string.
	*/			*/
	function phutil_utf8v($string, $byte_limit = null) {			function phutil_utf8v($string, $byte_limit = null) {
				$string = phutil_string_cast($string);

	$res = array();			$res = array();
	$len = strlen($string);			$len = strlen($string);

	$ii = 0;			$ii = 0;
	while ($ii < $len) {			while ($ii < $len) {
	$byte = $string[$ii];			$byte = $string[$ii];
	if ($byte <= "\x7F") {			if ($byte <= "\x7F") {
	$res[] = $byte;			$res[] = $byte;
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