<?php
class class_DB{
    private $mysqli;
    function __construct($database,$user,$password='',$host='127.0.0.1'){
        $this->mysqli = new mysqli($host, $user, $password, $database);
        if (mysqli_connect_error()) {
            die('Ошибка подключения (' . mysqli_connect_errno() . ') '. mysqli_connect_error());
        }
        $this->debugSql=array();
    }
    /*
    ЗАПРОС С ВЫБОРКОЙ И ВОЗВРАТ МАССИВА, 0 ЭЛЕМЕНТ КОЛ-ВО СТРОК
    */
    function QUR_SEL($sql){
        $out = array();
        $keyd = $this->debug_sql($sql,1);
        $qur = $this->mysqli->query($sql);
        $this->debug_sql($sql,2,$keyd);
        if ($qur){
            $kol = $qur->num_rows;
            $out['err'] = false;
            $out['kol'] = $kol;
            if ($kol){
                while($rez = $qur->fetch_assoc()){
                    $out['rez'][] = $rez;
                }
            }
        }else {
            $out['err'] = true;
            $out['sql']=$sql;
            $out['rep']='ОШИБКА БД!!! <br/>'.$sql.'<br />('.$this->mysqli->errno.') '.$this->mysqli->error;
        }
        return $out;
    }
    /*
	ЗАПРОС К БАЗЕ ДАННЫХ, И ВОЗВРАТ РЕЗУЛЬТАТА ЗАПРОСА
	*/
    function QUR($sql){
        $out = array();
        $qur = $this->mysqli->query($sql);
        if ($qur){
            $out['err']=false;
            $out['id']=$this->lastinsertID();
        }else{
            $out['err']=true;
            $out['sql']=$sql;
            $out['id']=0;
            $out['rep']='ОШИБКА БД!!! <br/>'.$sql.'<br />('.$this->mysqli->errno.') '.$this->mysqli->error;
            //echo '<pre>'.print_r($out,1).'</pre>';
            $this->log($out);
        }
        return $out;
    }

    function rescape($param){
        return $this->mysqli->real_escape_string($param);
    }
    function lastinsertID(){
        return $this->mysqli->insert_id;
    }

    function navpage($sql,$pole='id',$pkol=20){
        $out = array();
        $sql = preg_replace('/SELECT(.*)FROM/is','SELECT count('.$pole.') as kol FROM',$sql);
        $rez = $this->QUR_SEL($sql);
        //echo $sql.'<pre>'.print_r($rez,1).'</pre>';exit();
        if(!$rez['err']) {
            if(strpos($sql,'GROUP')!==false){
                $out['all'] = $rez['kol'];
            }else {
                $out['all'] = $rez['rez'][0]['kol'];
            }
            $out['pages'] = ceil($out['all'] / $pkol);
        }
        else {
            $out['all'] = 0;
            $out['pages'] = 0;
        }
        return $out;
    }
    function log($str){
        $msg = date('H:i:s d.m.Y').'::'.$_SESSION['user']['id'].'::'.$_SESSION['user']['fio'].'::';
        $msg .= print_r($str,1)."\n";
        file_put_contents('dblog.txt',$msg,FILE_APPEND);
    }
    function debug_sql($sql,$t,$keyd=''){
        //$file = 'debug_sqls2.csv';
        ////if(file_exists($file)) unlink($file);
        //$key = md5(time().$sql);
        ////if(!isset($this->debugSql[$key])) {
        //if($t==1){
        //    $this->debugSql[$key]['sql'] = $sql;
        //    $this->debugSql[$key]['times'][] = round(microtime(),3);
        //    return $key;
        //}
        //if($t==2){
        //    $last = round(microtime(),3);
        //    $this->debugSql[$keyd]['times'][] = $last;
        //    $this->debugSql[$keyd]['time'] = $last - $this->debugSql[$keyd]['times'][0];
        //    $m1=array("\n","\r"); $m2=array(" "," ");
        //    $str = date('H:i:s d.m.Y').';'.round($this->debugSql[$keyd]['time'],2).';"'.str_replace($m1,$m2,$sql).'";';
        //    $str .= '"'.$_SERVER['REMOTE_ADDR'].'";';
        //    $str .= '"'.$_SERVER['REQUEST_METHOD'].'";';
        //    $str .= '"'.$_SERVER['PHP_SELF'].'";';
        //    $str .= '"'.$_SERVER['argv'].'";';
        //    $debug_backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
        //    unset($debug_backtrace[0]);
        //    $str .= '"'.json_encode($debug_backtrace,JSON_UNESCAPED_UNICODE).'";';
        //    $str .= '"'.json_encode($_POST,JSON_UNESCAPED_UNICODE).'";';
        //    file_put_contents($file,$str."\n",FILE_APPEND);
        //    unset($this->debugSql[$keyd]);
        //}
    }

}
?>