PHP DB Connector

db.php

<?php    
include_once './util.php';

class DBConnector {        
  var $pdo;     
  
  function __construct(){                
    $dsn= "mysql:host=". Util::$SERVER_NAME . ";dbname=" . Util::$DB_NAME ."";                
    $options = [                         
      PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,                        
      PDO::ATTR_EMULATE_PREPARES => false,                        
      //Notice here that we read data from tables and is presented as an associative array                        
      //indexed by names of column                        
      PDO::ATTR_DEFAULT_FETCH_MODE =>PDO::FETCH_ASSOC                        
    ];                
    try{                        
      $this->pdo = new PDO($dsn, Util::$DB_USER, Util::$DB_USER_PASS, $options);				                
    }catch (PDOException $e){                        
      echo $e->getMessage();                
    }			        
  }        
  public function connectToDB(){                
    return $this->pdo;        
  } 			        
  public function closeDB(){                
    $this->pdo = null;        
  }    
}

?>