dedecms重新定义cn_substr函数截取字数更准确
<p style='margin: 0px; padding: 5px 0px; outline: none; font-size: 14px; line-height: 30px; font-family: tahoma, arial, "Microsoft YaHei";'>方法说明：</p>
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一、找到\include\helpers\string.helper.php把原来约33到102行（也就是定义cn_substr()函数的那段代码）替换掉，你要是怕不行，可以先把这个文件备份下，亲；</p>
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<span><u>复制代码</u></span>
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代码如下:</div>
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<br>
/** <br>
* 中英文截取字符串，汉字安2个字节 <br>
* <br>
* @access public <br>
* @param string $str 需要截取的字符串 <br>
* @param int $cutLen 截取的长度 <br>
* @param bool $cutSlashes 是否去掉\ <br>
* @param bool $addSlashes 是加\ <br>
* @param string $oDot 截取后加的字符串，如经常用的三个点 <br>
* @param bool $hasHtml 是否有html <br>
* @return string <br>
*/ <br>
if ( ! function_exists(‘cn_substr’)){ <br>
function cn_substr($str, $cutLen, $oDot = null, $hasHtml = false, $cutSlashes = false, $addSlashes = false) { <br>
global $cfg_soft_lang; <br>
$str = trim ( $str ); <br>
if ($cutSlashes) $str = stripslashes ( $str ); <br>
if($hasHtml){ <br>
$str = preg_replace ( “/(\<[^\<]*\>|\r|\n|\s|\[.+?\])/is”, ‘ ‘, $str ); <br>
$str = htmlspecialchars ( $str ); <br>
}else{ <br>
$str = htmlspecialchars ( $str ); <br>
} <br>
if ($cutLen && strlen ( $str ) > $cutLen) { <br>
$nStr = ”; <br>
if ($cfg_soft_lang == ‘utf-8′) { <br>
$n = 0; <br>
$tn = 0; <br>
$noc = 0; <br>
while ( $n < strlen ( $str ) ) { <br>
$t = ord ( $str [$n] ); <br>
if ($t == 9 || $t == 10 || (32 <= $t && $t <= 126)) { <br>
$tn = 1; <br>
$n ++; <br>
$noc ++; <br>
} elseif (194 <= $t && $t <= 223) { <br>
$tn = 2; <br>
$n += 2; <br>
$noc += 2; <br>
} elseif (224 <= $t && $t < 239) { <br>
$tn = 3; <br>
$n += 3; <br>
$noc += 2; <br>
} elseif (240 <= $t && $t <= 247) { <br>
$tn = 4; <br>
$n += 4; <br>
$noc += 2; <br>
} elseif (248 <= $t && $t <= 251) { <br>
$tn = 5; <br>
$n += 5; <br>
$noc += 2; <br>
} elseif ($t == 252 || $t == 253) { <br>
$tn = 6; <br>
$n += 6; <br>
$noc += 2; <br>
} else { <br>
$n ++; <br>
} <br>
if ($noc >= $cutLen)break; <br>
} <br>
if ($noc > $cutLen) $n -= $tn; <br>
$nStr = substr ( $str, 0, $n ); <br>
} else { <br>
for($i = 0; $i < $cutLen – 1; $i ++) { <br>
if (ord ( $str [$i] ) > 127) { <br>
$nStr .= $str [$i] . $str [$i + 1]; <br>
$i ++; <br>
} else { <br>
$nStr .= $str [$i]; <br>
} <br>
} <br>
} <br>
$str = $nStr . $oDot; <br>
} <br>
if ($addSlashes) $str = addslashes ( $str ); <br>
$str = htmlspecialchars_decode ( $str ); <br>
return trim ( $str ); <br>
} <br>
} </div>
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二、全站都使用cn_substr()函数，不管你程序是gbk还是utf8；</p>
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比如你要调用10个字（拼音汉字混杂）：即可</p>
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