php - Multiple database connections using multiton or any design pattern -


i have following code multiple database connections. it's not design. static. don't know how improve it. can add more functions prepare query, presently want good/clean design. tried make multiton design pattern. requirements like, first connect 1 database, database details of other mysql clients, loop , connect each database , something. so, need multiple connections. 

<?php  class db_class{  private static $instance = array();  private function __construct(){ }  public static function get_instance($type , $db_detail_array=array()){     $host = $db_detail_array['host'];     $username = $db_detail_array['username'];     $database = $db_detail_array['database'];     $password = $db_detail_array['password'];     if(empty($host) or empty($username) or empty($database) or empty($password)){         return;     }      if(empty(self::$instance[$type])) {             self::$instance[$type] = new mysqli($host, $username, $password, $database);         if (@self::$instance[$type]->connect_errno) {             echo self::$last_err = "connect failed";         }         } }  static function fetch_assoc($query,$type){     $db_query = self::run_query($query,$type);     $rows = array();     while($row = @$db_query->fetch_assoc()){         $rows[] = $row;     }     $db_query->free();     return($rows); }  static function escape($type,$value){     $value = self::$instance[$type]->real_escape_string($value);     return($value); }  static function run_query($query,$type){     self::$instance[$type]->ping();     $db_query = self::$instance[$type]->query($query);     if(self::$instance[$type]->error){         echo self::$last_err = self::$instance[$type]->error;echo "<p>$query, $type</p>";         return;     }     return($db_query) ; }  static function num_rows($query,$type){     $db_query = self::run_query($query,$type);     $num_rows = $db_query->num_rows;     return($num_rows); }  static function disconnect($type){     @self::$db_obj[$type]->close(); }  } ?>

please have @ pdo.

it unifier database object exposing common , effective interface.

it supports server types other mysql too.

even using plainly satisfactory.


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