dedecms 的cn_substr_utf8字符串截取函数商榷

思儒爸 發表於 2023-11-19 00:00:00

dedecms 的cn_substr_utf8字符串截取函数商榷

在dedecms里面 cn_substr_utf8 函数是这样的


<div class="msgheader" style='margin: 3px auto 0px; padding: 0px 3px; outline: none; line-height: 21.6px; clear: both; border-width: 1px; border-style: solid; border-color: rgb(0, 153, 204); background: rgb(246, 251, 255); overflow: hidden; font-family: tahoma, arial, "Microsoft YaHei";'>
<div class="right">
复制代码
</div>
代码如下:</div>
<div class="msgborder" id="phpcode8" style='margin: 0px auto 3px; padding: 0px 3px; outline: none; line-height: 25.2px; font-size: 14px; clear: both; border-right: 1px solid rgb(0, 153, 204); background: rgb(221, 237, 251); overflow: hidden; border-left: 1px solid rgb(0, 153, 204); word-break: break-all; border-bottom: 1px solid rgb(0, 153, 204); word-wrap: break-word; font-family: tahoma, arial, "Microsoft YaHei";'>
 
/** 
* 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 ''; 
} 
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($ar[$i]); $i++) 
{ 
if(strlen($tstr) < $start) 
{ 
$tstr .= $ar[$i]; 
} 
else 
{ 
if(strlen($str) < $length + strlen($ar[$i]) ) 
{ 
$str .= $ar[$i]; 
} 
else 
{ 
break; 
} 
} 
} 
return $str; 
} 
}</div>



其中


<div class="msgheader" style='margin: 3px auto 0px; padding: 0px 3px; outline: none; line-height: 21.6px; clear: both; border-width: 1px; border-style: solid; border-color: rgb(0, 153, 204); background: rgb(246, 251, 255); overflow: hidden; font-family: tahoma, arial, "Microsoft YaHei";'>
<div class="right">
复制代码
</div>
代码如下:</div>
<div class="msgborder" id="phpcode9" style='margin: 0px auto 3px; padding: 0px 3px; outline: none; line-height: 25.2px; font-size: 14px; clear: both; border-right: 1px solid rgb(0, 153, 204); background: rgb(221, 237, 251); overflow: hidden; border-left: 1px solid rgb(0, 153, 204); word-break: break-all; border-bottom: 1px solid rgb(0, 153, 204); word-wrap: break-word; font-family: tahoma, arial, "Microsoft YaHei";'>
 
if(strlen($str) < $length + strlen($ar[$i]) )</div>



一行可能会造成截取后多了一个字符，可以考虑改为


<div class="msgheader" style='margin: 3px auto 0px; padding: 0px 3px; outline: none; line-height: 21.6px; clear: both; border-width: 1px; border-style: solid; border-color: rgb(0, 153, 204); background: rgb(246, 251, 255); overflow: hidden; font-family: tahoma, arial, "Microsoft YaHei";'>
<div class="right">
复制代码
</div>
代码如下:</div>
<div class="msgborder" id="phpcode10" style='margin: 0px auto 3px; padding: 0px 3px; outline: none; line-height: 25.2px; font-size: 14px; clear: both; border-right: 1px solid rgb(0, 153, 204); background: rgb(221, 237, 251); overflow: hidden; border-left: 1px solid rgb(0, 153, 204); word-break: break-all; border-bottom: 1px solid rgb(0, 153, 204); word-wrap: break-word; font-family: tahoma, arial, "Microsoft YaHei";'>
 
if(strlen($str) < $length + strlen($ar[$i]) -1 )</div>



测试代码如下


<div class="msgheader" style='margin: 3px auto 0px; padding: 0px 3px; outline: none; line-height: 21.6px; clear: both; border-width: 1px; border-style: solid; border-color: rgb(0, 153, 204); background: rgb(246, 251, 255); overflow: hidden; font-family: tahoma, arial, "Microsoft YaHei";'>
<div class="right">
复制代码
</div>
代码如下:</div>
<div class="msgborder" id="phpcode11" style='margin: 0px auto 3px; padding: 0px 3px; outline: none; line-height: 25.2px; font-size: 14px; clear: both; border-right: 1px solid rgb(0, 153, 204); background: rgb(221, 237, 251); overflow: hidden; border-left: 1px solid rgb(0, 153, 204); word-break: break-all; border-bottom: 1px solid rgb(0, 153, 204); word-wrap: break-word; font-family: tahoma, arial, "Microsoft YaHei";'>
 
$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($ar[$i]); $i++) 
{ 
if(strlen($tstr) < $start) 
{ $tstr .= $ar[$i]; 
} 
else 
{ if(strlen($str) < $length + strlen($ar[$i]) ) 
{ $str .= $ar[$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($ar[$i]); $i++) 
{ 
if(strlen($tstr) < $start) 
{ $tstr .= $ar[$i]; 
} 
else 
{ if(strlen($str) < $length + strlen($ar[$i]) -1 ) // phpsir 加了 -1 
{ $str .= $ar[$i]; 
} 
else 
{ break; 
} 
} 
} 
return $str; 
}</div>
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dedecms 的cn_substr_utf8字符串截取函数商榷