-
- /**
- 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) <= $length) {
- 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, $pre.'>'.$end), $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];
- }
- }
- //还原特殊字符串
- $strcut = str_replace(array($pre.'&'.$end, $pre.'"'.$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;
- }
- ?>
以上就是php摘要生成函数的完整代码，大家复制到自己的编辑器中，然后测试运行吧。
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