Catch database error message

I have error message when try to access my controller

PHP Code:

A PHP Error was encountered
Severity: Notice
Message: Array to string conversion
Filename: controllers/Test.php
Line Number: 94 


this is my controller in CodeIgniter 2.x and worked :

PHP Code:

$dsn = $_POST['mysql_db_driver'].'://'.$_POST['db_username'].':'.$_POST['db_password'].'@'.$_POST['mysql_db_host'].'/'.$_POST['mysql_db_name'];
                $this->db = $this->load->database($dsn, TRUE);
                if (!empty($this->db) && $this->db->conn_id !== FALSE) {
                    $db_error = $this->db->_error_message();
                    if(!file_exists(FCPATH.'sample.sql')) {
                        $db_error.= '<br /'.$this->db->_error_message();
                    } 


and I change it in CodeIgniter 3.0 to :

PHP Code:

$dsn = $_POST['mysql_db_driver'].'://'.$_POST['db_username'].':'.$_POST['db_password'].'@'.$_POST['mysql_db_host'].'/'.$_POST['mysql_db_name'];
                $this->db = $this->load->database($dsn, TRUE);
                if (!empty($this->db) && $this->db->conn_id !== FALSE) {
                    $db_error = $this->db->error();
                    if(!file_exists(FCPATH.'sample.sql')) {
                        $db_error.= '<br /'.$this->db->error();
                    } 


Line number 94 is $db_error = $this->db->error();

Please help me

I have error message when try to access my controller

PHP Code:

A PHP Error was encountered
Severity: Notice
Message: Array to string conversion
Filename: controllers/Test.php
Line Number: 94 


this is my controller in CodeIgniter 2.x and worked :

PHP Code:

$dsn = $_POST['mysql_db_driver'].'://'.$_POST['db_username'].':'.$_POST['db_password'].'@'.$_POST['mysql_db_host'].'/'.$_POST['mysql_db_name'];
 $this->db = $this->load->database($dsn, TRUE);
 if (!empty($this->db) && $this->db->conn_id !== FALSE) {
 $db_error = $this->db->_error_message();
 if(!file_exists(FCPATH.'sample.sql')) {
 $db_error.= '<br /'.$this->db->_error_message();
 } 


and I change it in CodeIgniter 3.0 to :

PHP Code:

$dsn = $_POST['mysql_db_driver'].'://'.$_POST['db_username'].':'.$_POST['db_password'].'@'.$_POST['mysql_db_host'].'/'.$_POST['mysql_db_name'];
 $this->db = $this->load->database($dsn, TRUE);
 if (!empty($this->db) && $this->db->conn_id !== FALSE) {
 $db_error = $this->db->error();
 if(!file_exists(FCPATH.'sample.sql')) {
 $db_error.= '<br /'.$this->db->error();
 } 


Line number 94 is $db_error = $this->db->error();

Please help me

According to CI doc $this->db->error() returns an array containing its code and message.

PHP Code:

// PHP 5.4.0
$db_error .= '<br />' . $this->db->error()['code'] . $this->db->error()['message']; 


http://www.codeigniter.com/user_guide/da...ing-errors

Code:

A PHP Error was encountered
Severity: Notice
Message: Array to string conversion
Filename: controllers/Test.php
Line Number: 95
Backtrace:
File: C:\xampp\htdocs\test\application\controllers\test.php
Line: 95
Function: _error_handler

File: C:\xampp\htdocs\test\index.php
Line: 296
Function: require_once

Code:

Configuration doesn't saved
Array
0
0

Still get error message Array to string conversion