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/**
 * 按词分割字符串
 * @param $str 元字符串
 * @param $maxLength 单词最大长度
 * @return array
 */
function splitInWords($str, $maxLength = 16) {
 if(empty($str)) return array();
 if($maxLength <= 0) $maxLength = 1;
 $rawWords = explode(' ', $str);
 $words = array();
 foreach($rawWords as $word) {
 $len = mb_strlen($word);
 if($len > $maxLength) {
 $pos = 0;
 while($len > $maxLength) {
 $words[] = mb_substr($word, $pos, $maxLength);
 $pos += $maxLength;
 $len -= $maxLength;
 }
 $words[] = mb_substr($word, $pos, $maxLength);
 } else {
 $words[] = $word;
 }
 }
 return $words;
}

/**
 * 按行（指定长度）分割字符串
 * @param $str 元字符串
 * @param $length 每行最大字符数
 * @return array
 */
function splitInLines($str, $length = 80) {
 $lines = array();
 foreach(split("\n", $str) as $s) {
 preg_match_all("/./u", $s, $matches);
 $arr = $matches[0];
 for($i = 0; $i < ceil(count($arr)/$length); $i++) {
 $lines[] = join("", array_slice($arr, $i*$length, $length));
 }
 }
 return $lines;
}