-
-
/**
- php摘要生成函数
- link:http://bbs.it-home.org 2013-3-7
- */
- function cutstr($string, $length,$charset,$dot) {//字符,截取长度,字符集,结尾符
- if(strlen($string) return $string;
- }
- $pre = chr(1);
- $end = chr(1);
- //保护特殊字符串
- $string = str_replace(array('&', '"', ''), array($pre.'&'.$end, $pre.'"'.$end, $pre.''.$end), $string);
- $strcut = '';
- if(strtolower($charset) == 'utf-8') {
- $n = $tn = $noc = 0;
- while($n $t = ord($string[$n]);
- if($t == 9 || $t == 10 || (32 $tn = 1; $n++; $noc++;
- } elseif(194 $tn = 2; $n += 2; $noc += 2;
- } elseif(224 $tn = 3; $n += 3; $noc += 2;
- } elseif(240 $tn = 4; $n += 4; $noc += 2;
- } elseif(248 $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 $strcut .= ord($string[$i]) > 127 ? $string[$i].$string[++$i] : $string[$i];
- }
- }
- //还原特殊字符串
- $strcut = str_replace(array($pre.'&'.$end, $pre.'"'.$end, $pre.''.$end), array('&', '"', ''), $strcut);
- //修复出现特殊字符串截段的问题
- $pos = strrpos($s, chr(1));
- if($pos !== false) {
- $strcut = substr($s,0,$pos);
- }
- return $strcut.$dot;
- }
- ?>
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