ecshop 

define('EC_CHARSET','utf-8');

 tp5

在config.php 定义

'ec'=>[            'charset'=>'utf-8' //字符串编码        ],

includes\lib_base.php

/** * 截取UTF-8编码下字符串的函数 * * @param   string      $str        被截取的字符串 * @param   int         $length     截取的长度 * @param   bool        $append     是否附加省略号 * * @return  string */function sub_str($str, $length = 0, $append = true){    $str = trim($str);    $strlength = strlen($str);    if ($length == 0 || $length >= $strlength)    {        return $str;    }    elseif ($length < 0)    {        $length = $strlength + $length;        if ($length < 0)        {            $length = $strlength;        }    }    if (function_exists('mb_substr'))    {        $newstr = mb_substr($str, 0, $length, EC_CHARSET);    }    elseif (function_exists('iconv_substr'))    {        $newstr = iconv_substr($str, 0, $length, EC_CHARSET);    }    else    {        //$newstr = trim_right(substr($str, 0, $length));        $newstr = substr($str, 0, $length);    }    if ($append && $str != $newstr)    {        $newstr .= '...';    }    return $newstr;}

extends/kankta/ecshop/Libbase.php

    = $strlength)        {            return $str;        }        elseif ($length < 0)        {            $length = $strlength + $length;            if ($length < 0)            {                $length = $strlength;            }        }        if (function_exists('mb_substr'))        {            $newstr = mb_substr($str, 0, $length, EC_CHARSET);        }        elseif (function_exists('iconv_substr'))        {            $newstr = iconv_substr($str, 0, $length, EC_CHARSET);        }        else        {            //$newstr = trim_right(substr($str, 0, $length));            $newstr = substr($str, 0, $length);        }        if ($append && $str != $newstr)        {            $newstr .= '...';        }        return $newstr;    }}