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	/**			/**
	* Determine if a string is valid UTF-8.			* Determine if a string is valid UTF-8.
	*			*
	* @param string Some string which may or may not be valid UTF-8.			* @param string Some string which may or may not be valid UTF-8.
	* @return bool True if the string is valid UTF-8.			* @return bool True if the string is valid UTF-8.
	*/			*/
	function phutil_is_utf8($string) {			function phutil_is_utf8($string) {
	if (function_exists('mb_check_encoding')) {			if (function_exists('mb_check_encoding')) {
				// See T13527. In some versions of PHP, "mb_check_encoding()" strictly
				// requires a string parameter.
				$string = phutil_string_cast($string);

	// If mbstring is available, this is significantly faster than using PHP.			// If mbstring is available, this is significantly faster than using PHP.
	return mb_check_encoding($string, 'UTF-8');			return mb_check_encoding($string, 'UTF-8');
	}			}

	return phutil_is_utf8_slowly($string);			return phutil_is_utf8_slowly($string);
	}			}


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