重新定义cn_substr函数使截取字数更准确

2017-04-13 14:26:43 dedecms
打开 

include/helpers/string.helper.php 

文件,找到如下代码(

大约33到102行

) /**  *  中文截取2,单字节截取模式  *  * @access    public  * @param     string  $str  需要截取的字符串  * @param     int  $slen  截取的长度  * @param     int  $startdd  开始标记处  * @return    string  */ if ( ! function_exists('cn_substr')) {     function cn_substr($str, $slen, $startdd=0)     {         global $cfg_soft_lang;         if($cfg_soft_lang=='utf-8')         {             return cn_substr_utf8($str, $slen, $startdd);         }         $restr = '';         $c = '';         $str_len = strlen($str);         if($str_len < $startdd+1)         {             return '';         }         if($str_len < $startdd + $slen || $slen==0)         {             $slen = $str_len - $startdd;         }         $enddd = $startdd + $slen - 1;         for($i=0;$i<$str_len;$i++)         {             if($startdd==0)             {                 $restr .= $c;             }             else if($i > $startdd)             {                 $restr .= $c;             }             if(ord($str[$i])>0x80)             {                 if($str_len>$i+1)                 {                     $c = $str[$i].$str[$i+1];                 }                 $i++;             }             else             {                 $c = $str[$i];             }             if($i >= $enddd)             {                 if(strlen($restr)+strlen($c)>$slen)                 {                     break;                 }                 else                 {                     $restr .= $c;                     break;                 }             }         }         return $restr;     } }

替换为

/** * 中英文截取字符串,汉字安2个字节 * * @access public * @param string $str 需要截取的字符串 * @param int $cutLen 截取的长度 * @param bool $cutSlashes 是否去掉\ * @param bool $addSlashes 是加\ * @param string $oDot 截取后加的字符串,如经常用的三个点 * @param bool $hasHtml 是否有html * @return string */ if ( ! function_exists(‘cn_substr’)){ function cn_substr($str, $cutLen, $oDot = null, $hasHtml = false, $cutSlashes = false, $addSlashes = false) { global $cfg_soft_lang; $str = trim ( $str ); if ($cutSlashes) $str = stripslashes ( $str ); if($hasHtml){ $str = preg_replace ( “/(\<[^\<]*\>|\r|\n|\s|\[.+?\])/is”, ‘ ‘, $str ); $str = htmlspecialchars ( $str ); }else{ $str = htmlspecialchars ( $str ); } if ($cutLen && strlen ( $str ) > $cutLen) { $nStr = ”; if ($cfg_soft_lang == ‘utf-8′) { $n = 0; $tn = 0; $noc = 0; while ( $n < strlen ( $str ) ) { $t = ord ( $str [$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 >= $cutLen)break; } if ($noc > $cutLen) $n -= $tn; $nStr = substr ( $str, 0, $n ); } else { for($i = 0; $i < $cutLen – 1; $i ++) { if (ord ( $str [$i] ) > 127) { $nStr .= $str [$i] . $str [$i + 1]; $i ++; } else { $nStr .= $str [$i]; } } } $str = $nStr . $oDot; } if ($addSlashes) $str = addslashes ( $str ); $str = htmlspecialchars_decode ( $str ); return trim ( $str ); } }

修改后全站都可以使用cn_substr()函数,不管你的程序编码是gbk还是utf8

示例:调用10个字(拼音汉字混杂) [field:title function='cn_substr(@me,20)']