PHP 中文字符串处理函数

[code]function cutstr($string, $length, $dot = ’ …’) {
global $charset;

if(strlen($string) <= $length) {
	return $string;
}

$string = str_replace(array('&amp;', '&quot;', '&lt;', '&gt;'), array('&', '"', '<', '>'), $string);

$strcut = '';
if(strtolower($charset) == 'utf-8') {

	$n = $tn = $noc = 0;
	while($n < strlen($string)) {

		$t = ord($string[$n]);
		if($t == 9 || $t == 10 || (32 <= $t && $t <= 126)) {
			$tn = 1; $n++; $noc++;
		} elseif(194 <= $t && $t <= 223) {
			$tn = 2; $n += 2; $noc += 2;
		} elseif(224 <= $t && $t <= 239) {
			$tn = 3; $n += 3; $noc += 2;
		} elseif(240 <= $t && $t <= 247) {
			$tn = 4; $n += 4; $noc += 2;
		} elseif(248 <= $t && $t <= 251) {
			$tn = 5; $n += 5; $noc += 2;
		} elseif($t == 252 || $t == 253) {
			$tn = 6; $n += 6; $noc += 2;
		} else {
			$n++;
		}

		if($noc >= $length) {
			break;
		}

	}
	if($noc > $length) {
		$n -= $tn;
	}

	$strcut = substr($string, 0, $n);

} else {
	for($i = 0; $i < $length; $i++) {
		$strcut .= ord($string[$i]) > 127 ? $string[$i].$string[++$i] : $string[$i];
	}
}

$strcut = str_replace(array('&', '"', '<', '>'), array('&amp;', '&quot;', '&lt;', '&gt;'), $strcut);

return $strcut.$dot;

}[/code]如果你的字符串编码采用UTF-8编码格式,那么在使用这个函数的时候,需要将全局变量$charset赋值为utf-8$charset = 'utf-8';