How to use dedecms string interception function

#How to use dedecms string interception function?

dedecms cn_substr_utf8 string interception function discussion

Recommended study: 梦weavercms

This article I saw on phpsir, The main thing is that there seems to be some problems with the cn_substr_utf8 function of dedecms. Friends who study dedecms can take a look

The cn_substr_utf8 function in dedecms is like this

The code is as follows:

/**
* utf-8中文截取，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 $startdd 开始标记处
* @return string
*/
if ( ! function_exists('cn_substr_utf8'))
{
function cn_substr_utf8($str, $length, $start=0)
{
if(strlen($str) < $start+1)
{
return &#39;&#39;;
}
preg_match_all("/./su", $str, $ar);
$str = &#39;&#39;;
$tstr = &#39;&#39;;</p> <p> //为了兼容mysql4.1以下版本,与数据库varchar一致,这里使用按字节截取
for($i=0; isset($ar[0][$i]); $i++)
{
if(strlen($tstr) < $start)
{
$tstr .= $ar[0][$i];
}
else
{
if(strlen($str) < $length + strlen($ar[0][$i]) )
{
$str .= $ar[0][$i];
}
else
{
break;
}
}
}
return $str;
}
}

The code is as follows:

if(strlen($str) < $length + strlen($ar[0][$i]) )

One line may cause an extra character after interception. You can consider changing it to

The code is as follows:

if(strlen($str) < $length + strlen($ar[0][$i]) -1 )

The test code is as follows

The code is as follows:

$f = "你好fasdfa你fasdf#e#";
$pos = strpos($f,'#e#');
var_dump($pos);
var_dump(cn_substr_utf8($f,$pos));
var_dump(cn_substr_utf82($f,$pos));
 
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;
}
 
function cn_substr_utf8($str, $length, $start=0)
{
if(strlen($str) < $start+1)
{
return '';
}
preg_match_all("/./su", $str, $ar);
 
 $str = '';
$tstr = '';
 
 //为了兼容mysql4.1以下版本,与数据库varchar一致,这里使用按字节截取
for($i=0; isset($ar[0][$i]); $i++)
{
if(strlen($tstr) < $start)
{
 
 $tstr .= $ar[0][$i];
}
else
{
 
 if(strlen($str) < $length + strlen($ar[0][$i]) )
{
 
 $str .= $ar[0][$i];
}
else
{
 
 break;
}
}
}
return $str;
}
 
function cn_substr_utf82($str, $length, $start=0)
{
if(strlen($str) < $start+1)
{
return '';
}
preg_match_all("/./su", $str, $ar);
 
 $str = '';
$tstr = '';
 
 //为了兼容mysql4.1以下版本,与数据库varchar一致,这里使用按字节截取
for($i=0; isset($ar[0][$i]); $i++)
{
if(strlen($tstr) < $start)
{
 
 $tstr .= $ar[0][$i];
}
else
{
 
 if(strlen($str) < $length + strlen($ar[0][$i]) -1 ) // phpsir 加了 -1 
{
 
 $str .= $ar[0][$i];
}
else
{
 
 break;
}
}
}
return $str;
}

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