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<?php

class DB{
   private $link;

   function __construct( $config ){
      extract( $config );
      $this->link = mysqli_connect( $host, $user, $pass, $name, $port ) OR die( mysqli_connect_errno() );
      
   }
   
   function __destruct(){
      @mysqli_close( $this->link );
   }

   function clean( $str ){
      return mysqli_real_escape_string( $this->link, $str );
   }

   function query( $query ){
      $res = mysqli_query( $this->link, $query );
      echo mysqli_error( $this->link );
      return $res;
   }

   function queryRow( $query ){
      $res = $this->query( $query );
      $row = $res->fetch_array( MYSQLI_ASSOC );
      return $row;
   }

   function queryOne( $query ){
      $res = $this->query( $query );
      $row = $res->fetch_array( MYSQLI_NUM );
      return $row[0];
   }
   
   function queryAll( $query ){   
      $rows = array();      
      if( $this->link->multi_query( $query ) ){
         do{
            if( $result = $this->link->store_result() ){
               while( $row = $result->fetch_object() ){
                  $rows[] = $row;
               }
               $result->free();
            }
         }while( $this->link->next_result() );
      }
      return $rows;      
   }
   
   function getLastID(){
      return $this->queryOne( "SELECT LAST_INSERT_ID()" );
   }
}

// define db config
$db_config = array(
   'name' => 'db_name',
   'user' => 'db_username',
   'pass' => 'db_password',
   'host' => 'localhost',
   'port' => 'port'
   );
   
// initialize
$db = new DB( $db_config );

// set utf8 encode, to avoid encoding issues
$db->query( "SET lc_time_names = 'es_ES', NAMES 'utf8'");

// query example, multiple rows
$users = $db->queryAll( "SELECT * FROM users" );

// query example, one row
$nick = 'miquelcamps';
$user_info = $db->queryRow( sprintf( "SELECT * FROM users WHERE nick = '%s'", $db->clean( $nick ) ) );

// query example, one result
$total_users = $db->queryOne( "SELECT COUNT(*) FROM users" );

?>