Rewrite the code to PHP 7.0 and above.

<?

class DBI

{

    ## Class properties description

    var $dbh,      # database link handler

        $sth,      # resource handler

        $errno,    # database error number

        $errmsg,   # database error message

        $host,     # host

        $user,     # user name

        $pass,     # password

        $database, # database name

        $q,        # query text

        $log_file = '',  # Log FileName, if empty - no loging mysqlog.txt

        $time_limit = 1.5;       # Log only querys above this time

    #@@@ PUBLIC METHODS @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

    ### Connect to server and select database

    function connect($host="",$user="",$pass="", $database="")

    {

      error_reporting(!E_WARNING);

      $this->dbh=mysql_connect($host,$user,$pass);# or $this->GetError("Connection failed");

      if (!$this->dbh){

        echo "На сервере ведутся технические работы. Извините за доставленное неудобство.";

        exit;

        return false;

      }else{

          error_reporting(E_ALL & ~E_NOTICE);

          mysql_select_db($database) or $this->GetError("Database selection failed");

          $this->database = $database;

          return true;

      }

    }

    ## set auto_recoding from cp1251 to koi8ukr

    function cp1251_koi8(){

     $this->query("set option character set cp1251_koi8");

    }

    ## set auto_recoding to default

    function to_default(){

     $this->query("set option character set DEFAULT");

    }

    ### Send query

    function query($query="", $debug_query = 0){

        global $debug_query;

        if(!$query){

          echo "DB class error: [No query parameter]";

          $this->close();

          exit;

        }

        if($debug_query){

          //echo "<pre>".$query."</pre>";

          echo $query."<br>---<br>";

        }

        $this->q = $query;

        $page_parse_time_start = microtime();

        if($query)

         $this->sth =  mysql_query($query, $this->dbh) or $this->GetError("Query error");

        if ($_SERVER['REQUEST_URI'] and $this->log_file)

           $tmp = explode('.',$_SERVER['REQUEST_URI']);

        if($this->log_file && !in_array(strtolower($tmp[count($tmp)-1]),array('jpg', 'png', 'gif'))){

          $time_start = explode(' ', $page_parse_time_start);

          $time_end = explode(' ', microtime());

          $time_int = $time_end[1] + $time_end[0] - ($time_start[1] + $time_start[0]);

          if($time_int > $this->time_limit){

            $parse_time = number_format($time_int, 3);

            ###### лог запросов в файл #########

            $query = ereg_replace("\r", "", $query);

            $query = ereg_replace("\n", " ", $query);

            global $ROOT_DIRECTORY, $HTTP_AFTER, $domain;

            $fp = fopen($ROOT_DIRECTORY.$this->log_file, "a+");

            fwrite($fp, date(" H:i:s")." ".$parse_time." ".$_SERVER['REMOTE_ADDR']." ".($domain ? $domain.'.'.$HTTP_AFTER : $_SERVER['SERVER_NAME']).$_SERVER['REQUEST_URI']." ".session_id()." ".$query."\n");

            fclose($fp);

            ####################################

          }

        }

        return $this->sth;

    }

    ### Return number of result rows of last SELECT QUERY

    function num_rows($linkno=0)

     //$linkno - number of link resource (default = 0)

    {

        if (!$this->sth && !$linkno){  ## IF NO RESOURCE

            echo "No performed SELECT query: [Invalid resource link]";

            exit;

        }

        $num=mysql_num_rows($linkno ? $linkno : $this->sth);

        return $num;

    }

    ### Return number of affected rows of performed query

    function affected_rows()

     //$linkno - number of link resource (default = 0)

    {

        $num=mysql_affected_rows();

        return $num;

    }

    ### Fetch row as array

    function fetch_row($linkno=0)

         //$linkno - number of link resource (default = 0)

    {

      //echo $linkno;

      return mysql_fetch_row($linkno ? $linkno : $this->sth);

    }

    ### Fetch row as ac array

    function fetch_array($linkno=0)

         //$linkno - number of link resource (default = 0)

    {

      return mysql_fetch_array($linkno ? $linkno : $this->sth);

    }

    ### Fetch row as hash

    function fetch_hash($linkno=0)

         //$linkno - number of link resource (default = 0)

    {

      return mysql_fetch_assoc($linkno ? $linkno : $this->sth);

    }

    ### Data seek; Move result pointer to the row $row, by default 0

    function seek($row=0, $linkno=0)

     //$linkno - number of link resource (default = 0)

    {

      return mysql_data_seek($linkno ? $linkno : $this->sth,$row);

    }

    ### Fetch field

    function fetch_field($row=0,$field=0, $linkno=0){

     //$linkno - number of link resource (default = 0)

      $flag=true;

        if ($row<0 || $row>=$this->num_rows()){

            //echo "Data seek error: [Invalid row offset ($row)]";

            return false;

           }

        if ( (!is_int($field)) || $field<0 || $field>=$this->num_fields()){

            echo "Field seek error: [Invalid field offset ($field)]";

         exit;

        }

        return mysql_result($linkno ? $linkno : $this->sth,$row,$field);

    }

    function last_id(){

     return mysql_insert_id($this->dbh);

    }

    function num_fields($linkno=0){

     //$linkno - number of link resource (default = 0)

      if (!$this->sth && !$linkno){

        echo "Fetch length error: [Invalid resource link]";

        exit;

      }

      return mysql_num_fields($linkno ? $linkno : $this->sth);

    }

    ### Close connection

    function close(){

      @mysql_close($this->dbh);

    }

    #@@@ PRIVATE METHODS @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

    ##  Get database error parameters. Print error, close database connection and terminate

    function GetError($hint="")

    {

      $this->errno=mysql_errno($this->dbh);

      $this->errmsg=mysql_error($this->dbh);

      $this->close();

      $this->q = eregi_replace("select ", "<b>SELECT</b> ", $this->q);

      $this->q = eregi_replace("update ", "<b>UPDATE</b> ", $this->q);

      $this->q = eregi_replace("insert ", "<b>INSERT</b> ", $this->q);

      $this->q = eregi_replace(" from ", "\n<b>FROM</b> ", $this->q);

      $this->q = eregi_replace(" left ", "\n<b>LEFT</b> ", $this->q);

      $this->q = eregi_replace(" right ", "\n<b>RIGHT</b> ", $this->q);

      $this->q = eregi_replace(" join ", " <b>JOIN</b> ", $this->q);

      $this->q = eregi_replace(" where ", "\n<b>WHERE</b> ", $this->q);

      $this->q = eregi_replace(" order ", "\n<b>ORDER</b> ", $this->q);

      $this->q = eregi_replace(" group ", "\n<b>GROUP</b> ", $this->q);

      $this->q = eregi_replace(" limit ", "\n<b>LIMIT</b> ", $this->q);

      $e = debug_backtrace();

      echo '<b>Error</b> in line: <b>'.$e[1]['line'].'</b> [<font color="green">'.$e[1]['file'].'</font>]';

      echo '<pre>';

      echo $this->q;

      echo '</pre>';

      echo "<b>$hint.</b> Error #",$this->errno,"<blockquote>",$this->errmsg,"</blockquote>";

      exit;

    }

}

?>

Здравствуйте. Пришлите сам класс.