PHP iconv_substr函数代码示例

 /**
  *	截取字符串
  *	@param $st 
  *		要截取的字符串
  *	@param $start
  *		开始位置
  *	@param $length
  *		截取的长度
  *	@param $charset
  *		字符编码
  *	@param $suffix
  *		是否显示 "... "
  *	@return  String
  *	
  */
 public static function msubstr($str, $start = 0, $length, $charset = 'UTF8', $suffix = true)
 {
     //字符占位宽
     $width = 0;
     //处理后的字符串
     $cut_str = '';
     //debug
     if ($charset == 'utf-8') {
         $charset = 'UTF8';
     }
     if (function_exists('mb_strlen')) {
         $width = (strlen($str) + mb_strlen($str, $charset)) / 2;
     } else {
         $width = strlen($str) / 2;
     }
     if ($width > $length) {
         if (function_exists('mb_substr')) {
             $cut_str = mb_substr($str, $start, $length, $charset);
         } elseif (function_exists('iconv_substr')) {
             $cut_str = iconv_substr($str, $start, $length, $charset);
         }
     } else {
         $cut_str = $str;
     }
     if ($suffix) {
         $cut_str = $cut_str . '...';
     }
     return $cut_str;
 }

 public function posts_list()
 {
     $this->display('Public:head');
     $tag = I('get.tag');
     $c_tag = $this->tag_exists($tag);
     $db_name = CONTROLLER_NAME . '_' . $tag;
     $m = M($db_name);
     $count = $m->where(array('isT' => 1))->count();
     //分页
     $Page = new \Think\Page($count, 10);
     $Page->setConfig('theme', '当前第%NOW_PAGE%页&nbsp; 共%TOTAL_PAGE%页   &nbsp; %FIRST%   %UP_PAGE%    %LINK_PAGE%     %DOWN_PAGE% &nbsp;     %END%  <b>%HEADER%</b> ');
     $pager = $Page->show();
     $posts = $m->where(array('isT' => 1))->order('last_post_time desc')->limit($Page->firstRow . ',' . $Page->listRows)->select();
     foreach ($posts as $k => $v) {
         $posts[$k]['content'] = iconv_substr($v['content'], 0, 300, 'utf-8');
     }
     //dump($posts);
     //dump($pager);
     // exit;
     $this->assign('tag', $tag);
     $this->assign('c_tag', $c_tag);
     $this->assign('posts', $posts);
     $this->assign('pager', $pager);
     $this->display();
     $this->display('Public:foot');
 }

 /**
  * Saving visitor information
  *
  * @param   Mage_Log_Model_Visitor $visitor
  * @return  Mage_Log_Model_Mysql4_Visitor
  */
 protected function _saveVisitorInfo($visitor)
 {
     $write = $this->_getWriteAdapter();
     $data = array('visitor_id' => $visitor->getId(), 'http_referer' => iconv_substr($visitor->getHttpReferer(), 0, 250), 'http_user_agent' => $visitor->getHttpUserAgent(), 'http_accept_charset' => $visitor->getHttpAcceptCharset(), 'http_accept_language' => $visitor->getHttpAcceptLanguage(), 'server_addr' => $visitor->getServerAddr(), 'remote_addr' => $visitor->getRemoteAddr());
     $write->insert($this->getTable('log/visitor_info'), $data);
     return $this;
 }

function adjDBValue($value, $len = -1)
{
    if ($value === null) {
        return null;
    }
    if (is_array($value)) {
        foreach ($value as $key => $val) {
            $value[$key] = adjDBValue($val, $len);
        }
    } else {
        $value = trim($value);
        // NON-Multibyte here!
        if (strlen($value) == 0) {
            // NON-Multibyte here!
            return null;
        }
        if ($len >= 0) {
            // Multibyte here!
            if (defined('R3_APP_CHARSET_DB')) {
                // PHP-BUG (iconv_substr($value, 0, 1, "UFT-8"); faild!)
                if (iconv_strlen($value, R3_APP_CHARSET_DB) > 1) {
                    $value = iconv_substr($value, 0, $len, R3_APP_CHARSET_DB);
                }
            } else {
                $value = substr($value, 0, $len);
            }
        }
    }
    return $value;
}

 /**
  * Filter: removes unnecessary whitespace and shortens value to control's max length.
  * @return string
  */
 public function sanitize($value)
 {
     if ($this->control->maxlength && iconv_strlen($value, 'UTF-8') > $this->control->maxlength) {
         $value = iconv_substr($value, 0, $this->control->maxlength, 'UTF-8');
     }
     return String::trim(strtr($value, "\r\n", '  '));
 }

function msubstr($str, $start = 0, $length, $charset = "utf-8", $suffix = true)
{
    if (function_exists("mb_substr")) {
        if ($suffix) {
            return mb_substr($str, $start, $length, $charset) . "...";
        } else {
            return mb_substr($str, $start, $length, $charset);
        }
    } elseif (function_exists('iconv_substr')) {
        if ($suffix) {
            return iconv_substr($str, $start, $length, $charset) . "...";
        } else {
            return iconv_substr($str, $start, $length, $charset);
        }
    }
    $re['utf-8'] = "/[x01-x7f]|[xc2-xdf][x80-xbf]|[xe0-xef]\r\n                  [x80-xbf]{2}|[xf0-xff][x80-xbf]{3}/";
    $re['gb2312'] = "/[x01-x7f]|[xb0-xf7][xa0-xfe]/";
    $re['gbk'] = "/[x01-x7f]|[x81-xfe][x40-xfe]/";
    $re['big5'] = "/[x01-x7f]|[x81-xfe]([x40-x7e]|xa1-xfe])/";
    preg_match_all($re[$charset], $str, $match);
    $slice = join("", array_slice($match[0], $start, $length));
    if ($suffix) {
        return $slice . "…";
    }
    return $slice;
}

 /**
  * Filter: removes unnecessary whitespace and shortens value to control's max length.
  * @return string
  */
 public function sanitize($value)
 {
     if ($this->control->maxlength && Nette\Utils\Strings::length($value) > $this->control->maxlength) {
         $value = iconv_substr($value, 0, $this->control->maxlength, 'UTF-8');
     }
     return Nette\Utils\Strings::trim(strtr($value, "\r\n", '  '));
 }

 public function truncate($string, $length = 50, $chars = true, $postfix = '...')
 {
     $truncated = trim($string);
     if (!$string) {
         return $truncated;
     }
     $length = (int) $length;
     if ($chars) {
         $fullLength = iconv_strlen($truncated, 'UTF-8');
         if ($fullLength > $length) {
             $truncated = trim(iconv_substr($truncated, 0, $length, 'UTF-8')) . $postfix;
         }
         // words
     } else {
         $truncated = str_replace('  ', ' ', $truncated);
         $words = explode(' ', $truncated);
         $truncated = '';
         $count = count($words);
         for ($i = 0; $i < $count; $i++) {
             $truncated .= $words[$i] . ' ';
             if ($length == $i) {
                 $truncated .= $postfix;
                 break;
             }
         }
     }
     return $truncated;
 }

 public function updateAction()
 {
     //处理接收参数
     $id = intval($this->_getParam('id'));
     $pid = intval($this->_getParam('pid'));
     $catName = iconv_substr($this->_getParam('catname'), 0, 100, 'utf-8');
     $description = iconv_substr($this->_getParam('description'), 0, 500, 'utf-8');
     $display = intval($this->_getParam('display'));
     $order = intval($this->_getParam('order'));
     //是否显示赋值
     $display !== 0 && ($display = 1);
     if (empty($catName)) {
         Zshop_Message::show($this, '带*号内容必须输入', 'back', 2);
     } else {
         $catalog = array('pid' => $pid, 'catname' => $catName, 'display' => $display, 'description' => $description, 'order' => $order);
         $isUpdated = $this->goodsCatalogModel->update($catalog, $id);
         if ($isUpdated) {
             $message = '修改成功';
             $url = 'admin/goodscatalog/index';
         } else {
             $message = '修改失败';
             $url = 'back';
         }
         Zshop_Message::show($this, $message, $url, 2);
     }
 }

 /**
  * 截取UTF-8下字符串的函数
  * 
  * @param string  $str
  * @param int	$length
  * @param bool $append
  * 
  * @return string
  */
 protected static function sub_str($str, $length = 0, $append = true)
 {
     $str = trim($str);
     $strlength = strlen($str);
     if ($length == 0 || $length >= $strlength) {
         return false;
     } else {
         if ($length < 0) {
             $length = $strlength + $length;
             if ($length < 0) {
                 $length = $strlength;
             }
         }
     }
     if (function_exists('mb_substr')) {
         $newstr = mb_substr($str, 0, $length, 'UTF-8');
     } else {
         if (function_exists('iconv_substr')) {
             $newstr = iconv_substr($str, 0, $length, 'UTF-8');
         } else {
             $newstr = substr($str, 0, $length);
         }
     }
     if ($append && $str != $newstr) {
         $newstr .= '...';
     }
     return $newstr;
 }

 public function cstr($text, $start = 0, $limit = 12)
 {
     if (function_exists('mb_substr')) {
         $more = mb_strlen($text) > $limit ? TRUE : FALSE;
         $text = mb_substr($text, 0, $limit, 'UTF-8');
         return array($text, $more);
     } elseif (function_exists('iconv_substr')) {
         $more = iconv_strlen($text) > $limit ? TRUE : FALSE;
         $text = iconv_substr($text, 0, $limit, 'UTF-8');
         return array($text, $more);
     } else {
         preg_match_all("/[x01-x7f]|[xc2-xdf][x80-xbf]|xe0[xa0-xbf]\r\n    \t\t[x80-xbf]|[xe1-xef][x80-xbf][x80-xbf]|xf0[x90-xbf][x80-xbf][x80-xbf]\r\n    \t\t|[xf1-xf7][x80-xbf][x80-xbf][x80-xbf]/", $text, $ar);
         if (func_num_args() >= 3) {
             if (count($ar[0]) > $limit) {
                 $more = TRUE;
                 $text = join("", array_slice($ar[0], 0, $limit));
             }
             $more = TRUE;
             $text = join("", array_slice($ar[0], 0, $limit));
         } else {
             $more = FALSE;
             $text = join("", array_slice($ar[0], 0));
         }
         return array($text, $more);
     }
 }

 /**
  * cut string
  *
  * @param  string $value
  * @param  int    $len
  * @param  string $encode
  * @return string
  */
 public static function Cut($value, $len, $encode = "UTF-8")
 {
     if (empty($value)) {
         return $value;
     }
     return iconv_substr($value, 0, $len, $encode);
 }

function msubstr($str, $start = 0, $length, $charset = "utf-8", $suffix = true)
{
    if (function_exists("mb_substr")) {
        if ($suffix && strlen($str) > $length) {
            return mb_substr($str, $start, $length, $charset) . "...";
        } else {
            return mb_substr($str, $start, $length, $charset);
        }
    } elseif (function_exists('iconv_substr')) {
        if ($suffix && strlen($str) > $length) {
            return iconv_substr($str, $start, $length, $charset) . "...";
        } else {
            return iconv_substr($str, $start, $length, $charset);
        }
    }
    $re['utf-8'] = "/[-]|[�-�][�-�]|[�-�][�-�]{2}|[�-�][�-�]{3}/";
    $re['gb2312'] = "/[-]|[�-�][�-�]/";
    $re['gbk'] = "/[-]|[�-�][@-�]/";
    $re['big5'] = "/[-]|[�-�]([@-~]|�-�])/";
    preg_match_all($re[$charset], $str, $match);
    $slice = join("", array_slice($match[0], $start, $length));
    if ($suffix) {
        return $slice . "…";
    }
    return $slice;
}

/**
 * 字符串截取，支持中文和其他编码
 * @static
 * @access public
 * @param string $str 需要转换的字符串
 * @param string $start 开始位置
 * @param string $length 截取长度
 * @param string $charset 编码格式
 * @param string $suffix 截断显示字符
 * @return string
 */
function msubstr($str, $start = 0, $length, $charset = "utf-8", $suffix = '...')
{
    $total = 0;
    if (function_exists("mb_substr")) {
        $total = mb_strlen($str, $charset);
        if ($total <= $length) {
            return $str;
        }
        $slice = mb_substr($str, $start, $length, $charset);
    } elseif (function_exists('iconv_substr')) {
        $total = iconv_strlen($str, $charset);
        if ($total <= $length) {
            return $str;
        }
        $slice = iconv_substr($str, $start, $length, $charset);
        if (false === $slice) {
            $slice = '';
        }
    } else {
        $re['utf-8'] = "/[-]|[�-�][�-�]|[�-�][�-�]{2}|[�-�][�-�]{3}/";
        $re['gb2312'] = "/[-]|[�-�][�-�]/";
        $re['gbk'] = "/[-]|[�-�][@-�]/";
        $re['big5'] = "/[-]|[�-�]([@-~]|�-�])/";
        preg_match_all($re[$charset], $str, $match);
        $total = count($match[0]);
        if ($total <= $length) {
            return $str;
        }
        $slice = join("", array_slice($match[0], $start, $length));
    }
    return $suffix ? $slice . $suffix : $slice;
}

/**
 * 字符串截取，支持中文和其他编码
 * @static
 * @access public
 * @param string $str 需要转换的字符串
 * @param string $start 开始位置
 * @param string $length 截取长度
 * @param string $charset 编码格式
 * @param string $suffix 截断显示字符
 * @return string
 */
function msubstr($str, $start = 0, $length, $charset = "utf-8", $suffix = false)
{
    if (function_exists("mb_strimwidth")) {
        $slice = mb_strimwidth($str, $start, $length, '', $charset);
        // mb_strimwidth 截取字符串 中文算2个字节，英文算1个
    } elseif (function_exists('mb_substr')) {
        $slice = mb_substr($str, $start, $length, $charset);
    } elseif (function_exists("iconv_substr")) {
        $slice = iconv_substr($str, $start, $length, $charset);
    } else {
        $re['utf-8'] = "/[-]|[�-�][�-�]|[�-�][�-�]{2}|[�-�][�-�]{3}/";
        $re['gb2312'] = "/[-]|[�-�][�-�]/";
        $re['gbk'] = "/[-]|[�-�][@-�]/";
        $re['big5'] = "/[-]|[�-�]([@-~]|�-�])/";
        preg_match_all($re[$charset], $str, $match);
        $slice = join("", array_slice($match[0], $start, $length));
    }
    if ($suffix) {
        return mb_strwidth($slice, $charset) > $length ? $slice : $slice . '...';
        // mb_strwidth 计算字符串长度 中文算2个字节，英文算1个
    } else {
        return $slice;
    }
    //    return $suffix ? $slice.'...' : $slice;
}