mysql_connect() not working from class - php

Question

Just moved my site to new hosting. On the new server mysql_connect() works fine if called without using classes or inside of the method but not from the _construct. When connecting from the _construct the following error displays:
Access denied for user 'root'#'localhost' (using password: NO)...my configuration defines the user not as root but as USERNAME and does provides a password.
PHP 5.6, MySQL 5.5, Linux
Class File:
function __construct(){
error_reporting(E_ERROR);
$dbhost = 'localhost';
$dbuser = 'USERNAME';
$dbpass = 'PASSWORD';
$dbname = 'DATABASENAME';
$this->urlAppPath = "http://www.myurl.com/CD/";
// connect to the database
$this->db = mysql_connect($dbhost, $dbuser, $dbpass) or die("Connection Error: " . $SQL);
mysql_select_db($dbname);
}
function validatePerson($personID) {
$SQL = "SELECT *,COUNT(*) AS total FROM zen_customers WHERE customers_classware_id = '$personID'";
$result = mysql_query( $SQL ) or die("Could not execute query 1 . ".$SQL." ".mysql_error()." & ". $dbhost ." ".$dbuser ." ".$dbpass." ".$dbname);
}
Call Method File:
require_once('./clsCart.php');
$myclass = new clsCart();
$result2 = $myclass->validatePerson($personID);
Note
If I define and call the connection within the file that I have been trying to call the method...that is instead of calling the method it works. If I define and call the connection within the method it works...but if I define and call the connection within the construct() it does not work...error "Access denied for user 'root'#'localhost' (using password: NO)". This seems to be specific to some servers...regardless of using PHP 5.6 or lower & MySQL 5.6 or lower.
So, if I use :
$dbhost = 'localhost';
$dbuser = 'USERNAME';
$dbpass = 'PASSWORD';
$dbname = 'DATABASENAME';
// connect to the database
$conn = mysql_connect($dbhost, $dbuser, $dbpass) or die("Connection Error: " . $SQL);
mysql_select_db($dbname);
Outside of the class or within the method then it works...but, I should (as I have in the past) be able to connect within the construct().

Answer 1

This seems to be related to a server issue. From the __contruct() only the Database default user information is being recognized. Everywhere else in the applications uses the User created for the database, but the construct will only connect when using the default database user on this server. Other servers are not having this issue, such that any database user with all privileges work.

Answer 2

You have to use mysqli_connect. Please never use mysql_connect it deprecated in PHP 5.5.0 and onwards. If still you face issue please let us know.
Following code for mysqli_connect :
<?php
$con = mysqli_connect("localhost","my_user","my_password","my_db");
// Check connection
if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
?>
Definition and Usage
The mysqli_connect() function opens a new connection to the MySQL server.
Syntax
mysqli_connect(host,username,password,dbname,port,socket);
Parameter Description
port Optional. Specifies the port number to attempt to connect to the MySQL server.
socket Optional. Specifies the socket or named pipe to be used.