中文字符串截取(UTF-8与非UTF-8)代码,PHP代码库,德仔网

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【PHP】中文字符串截取(UTF-8与非UTF-8)

作者:Dezai.CN / 发布于2013/10/22/ 504


	function cutstr ($string, $length, $dot = '...', $charset = 'utf-8') {

	 //功能:按长度截取字符串
	 //$string, $length, $dot,$charset
	 //字符串,要取长度,截断符,编码


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

	 $string = str_replace(array('&', '"', '<', '>'), 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('&', '"', '<', '>'), $strcut);

	 return $strcut . $dot;
	}

	$str = "我们要截取的字符串";
	echo cutstr($str, 15, "...", 'utf-8');

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　字符串截取　

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