A PHP wrapper to connect to different databases using PHP Data Objects extension (PDO) ex. mysql, mysqli, postgressSQL

dbcon.php

<?php
class DBCON{
 	/**
 	 *initialize all the components for database
 	 *
 	 *allow you to construct parallel database session using different dbms like mysql,pgsql etc.
 	 *
 	 *@param string $db_ini_dbms set your current database management system
 	 *@param string $db_ini_host set your host ex.127.0.0.1
 	 *@param string $db_ini_username set your username ex. root
 	 *@param string $db_ini_password set your password default empty
 	 *@param string $db_ini_dbname set your database name default empty
 	 *@param string $db_ini_port set your :port default empty 
 	 *@return PDO
 	*/
	
	function __construct($db_ini_dbms,$db_ini_host,$db_ini_username,$db_ini_password=NULL,$db_ini_dbname='',$db_ini_port=''){
 		#pdo instance
 		$this->pdo=null;
 	
	 	#check for different dbms and catch errors for all exceptions
	 	try{
	
	 		switch ($db_ini_dbms) {
	 			case 'mysql':
	 				#mysql
	 				$this->pdo=new PDO($db_ini_dbms.':host='.$db_ini_host.((!empty($db_ini_port)) ? (';port=' . $db_ini_port) : '').';dbname='.$db_ini_dbname,$db_ini_username,$db_ini_password);
	 				break;
	
	 			case 'mysqli':
	 				#mysqli
	 				mysqli_report(MYSQLI_REPORT_STRICT);
	 				$this->pdo=new mysqli($db_ini_host,$db_ini_username,$db_ini_password,$db_ini_dbname);
	 				break;
	
	 			case 'pgsql':
	 				#postgress
	 				$this->pdo=new PDO($db_ini_dbms.':host='.$db_ini_host.((!empty($db_ini_port)) ? (';port=' . $db_ini_port) : '').';dbname='.$db_ini_dbname.';user='.$db_ini_username.';password='.$db_ini_password);
	 				break;
	
	 			default:
	 				# code...
	 			break;
	
	 		}
	
	 	}catch(Exception $e){ echo "error has occured.Please try to refresh the page"; }
 		return $this->pdo;
 	}
	function __toString(){
		return 'status:connected';
	}
}
?>