php要截取一段汉语文字,怎样才能保证不把汉字拆开?

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共3个回答

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还得看你的编码是gbk的还是UTF8的。

以下是UTF-8的编码下的截取
function smarty_modifier_truncate_utf8($string, $length, $etc = '...')
{
$result = '';

$string = html_entity_decode(trim(strip_tags($string)), ENT_QUOTES, 'UTF-8');

$strlen = strlen($string);

for($i = 0; (($i < $strlen) && ($length > 0)); $i++)
{
if($number = strpos(str_pad(decbin(ord(substr($string, $i, 1))), 8, '0', STR_PAD_LEFT), '0'))
{
if($length < 1.0)
{
break;
}

$result .= substr($string, $i, $number);

$length -= 1.0;

$i += $number - 1;
}
else
{
$result .= substr($string, $i, 1);

$length -= 0.5;
}
}

$result = htmlspecialchars($result, ENT_QUOTES, 'UTF-8');

if($i < $strlen)
{
$result .= $etc;
}

return $result;
}

以下是GBK编码下的截取(常用)

function gbk_strlen($string)
{
if(extension_loaded('mbstring'))
{
mb_internal_encoding('GBK');

return mb_strlen($string);
}
else
{
preg_match_all('/[\x81-\xfe]?./', $string, $match);

return count($match[0]);
}
}

function gbk_substr($string, $start, $length = null)
{
if(extension_loaded('mbstring'))
{
mb_internal_encoding('GBK');

if(is_null($length))
{
return mb_substr($string, $start);
}
else
{
return mb_substr($string, $start, $length);
}
}
else
{
preg_match_all('/[\x81-\xfe]?./', $string, $match);

if(is_null($length))
{
return implode('', array_slice($match[0], $start));
}
else
{
return implode('', array_slice($match[0], $start, $length));
}
}
}
function smarty_modifier_truncate_gbk($string, $length = 80, $etc = '...',
$break_words = false, $middle = false)
{
if ($length == 0)
return '';

if (gbk_strlen($string) > $length) {
$length -= gbk_strlen($etc);
if (!$break_words && !$middle) {
$string = preg_replace('/\s+?(\S+)?$/', '', gbk_substr($string, 0, $length+1));
}
if(!$middle) {
return gbk_substr($string, 0, $length).$etc;
} else {
return gbk_substr($string, 0, $length/2) . $etc . gbk_substr($string, -$length/2);
}
} else {
return $string;
}
}

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判断 ASCII 的高位 > 128

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参考：http://www.readlog.cn/show-180-1.htm