[PHP]UTF-8编码的wordwrap函数

PHP的wordwrap能将一段字符串根据指定长度来进行自动换行，但它不支持UTF-8.于是，自己写了一个utf-8版的wordwrap

/**
 * utf-8编码的自动换行
 * utf-8编码的wordwrap实现
 * @param string $str
 * @param int $length
 * @param string $break
 * @return string
 * @author LoRui(i@lorui.com, www.lorui.com)
 */
function wordwrap_utf8($str, $length = 75, $break = '<br />') {
	$len = mb_strlen($str,'utf-8');
	if($len <= $length) return $str;
	$temp = array();
	$num = ceil($len/$length);
	for($i = 0; $i < $num; $i++) {
		array_push($temp,
			mb_substr($str, $length*$i, $length, 'utf-8')
		);
	}
	return implode($break, $temp);
}

#测试
echo wordwrap_utf8('一二三四五六七八九十1234567890甲乙丙丁abcdefghijklmn', 5);

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