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troca de mysql para mysqli, com erro no login


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<?php
error_reporting (E_ALL & ~ E_NOTICE & ~ E_DEPRECATED); /* tramento de advertencia para que não exiba*/
# FileName="Connection_php_mysql.htm"
# Type="MYSQL"
# HTTP="true"
$hostname_painel_config = "localhost";
$database_painel_config = "imobi";
$username_painel_config = "root";
$password_painel_config = "vertrigo";
$painel_config = mysql_pconnect($hostname_painel_config, $username_painel_config, $password_painel_config) or trigger_error(mysql_error(),E_USER_ERROR); 
?>
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------
troquei essa conxeção acima mysql por essa abaixo mysqli...porem meu sistema de login parou de funcionar até agora não conseguir resolver. aparesce a seguinte mesangem,  "Access denied for user ''@'localhost' (using password: NO)"
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------
<?php
$host = "localhost";
$usuario = "root";
$senha = "vertrigo";
$bb = "imobi";
 
$mysqli = new mysqli($host, $usuario, $senha, $bb);
 
if($mysqli->connect_errno)
   echo "Falha na conexão;(".$mysqli->connect_errno.") ".$mysqli->connect_error;
//ini_set('display_errors',false);
 
?>
---------------------------------------------------------------------------------------------------------------------------------------------
abaixo codigo do sistema de login. desde já agradeço ajuda...
 
 
<?php require_once ('Connections/conexao.php'); ?>
<?php
if (!function_exists("GetSQLValueString")) {
function GetSQLValueString($theValue, $theType, $theDefinedValue = "", $theNotDefinedValue = "") 
{
  if (PHP_VERSION < 6) {
    $theValue = get_magic_quotes_gpc() ? stripslashes($theValue) : $theValue;
  }
 
  $theValue = function_exists("mysql_real_escape_string") ? mysql_real_escape_string($theValue) : mysql_escape_string($theValue);
 
  switch ($theType) {
    case "text":
      $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";
      break;    
    case "long":
    case "int":
      $theValue = ($theValue != "") ? intval($theValue) : "NULL";
      break;
    case "double":
      $theValue = ($theValue != "") ? doubleval($theValue) : "NULL";
      break;
    case "date":
      $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";
      break;
    case "defined":
      $theValue = ($theValue != "") ? $theDefinedValue : $theNotDefinedValue;
      break;
  }
  return $theValue;
}
}
?>
<?php
// *** Validate request to login to this site.
if (!isset($_SESSION)) {
  session_start();
}
 
$loginFormAction = $_SERVER['PHP_SELF'];
if (isset($_GET['accesscheck'])) {
  $_SESSION['PrevUrl'] = $_GET['accesscheck'];
}
 
if (isset($_POST['usuario'])) {
  $loginUsername=$_POST['usuario'];
  $password=$_POST['senha'];
  $MM_fldUserAuthorization = "usuarioNivel";
  $MM_redirectLoginSuccess = "admin/painel.php";
  $MM_redirectLoginFailed = "admin/erro.php";
  $MM_redirecttoReferrer = false;
  mysql_select_db($database_painel_config, $painel_config);
 
  $LoginRS__query=sprintf("SELECT email, senha, usuarioNivel FROM quimovel_clientes WHERE email=%s AND senha=%s",
  GetSQLValueString($loginUsername, "text"), GetSQLValueString($password, "text")); 
   
  $LoginRS = mysql_query($LoginRS__query, $painel_config) or die(mysql_error());
  $loginFoundUser = mysql_num_rows($LoginRS);
  if ($loginFoundUser) {
    
    $loginStrGroup  = mysql_result($LoginRS,,'usuarioNivel');
    
if (PHP_VERSION >= 5.1) {session_regenerate_id(true);} else {session_regenerate_id();}
    //declare two session variables and assign them
    $_SESSION['MM_Username'] = $loginUsername;
    $_SESSION['MM_UserGroup'] = $loginStrGroup;      
 
    if (isset($_SESSION['PrevUrl']) && false) {
      $MM_redirectLoginSuccess = $_SESSION['PrevUrl'];
    }
    header("Location: " . $MM_redirectLoginSuccess );
  }
  else {
    header("Location: ". $MM_redirectLoginFailed );
  }
}
?>
 
 
<!DOCTYPE html>
<html lang="pt-br">
<head>
    <meta charset="UTF-8"/>
    <title>site</title>
    <link rel="stylesheet" type="text/css" href="estilo-login.css">
    
    
<?php include "Connections/config.php";?>
<?php include "js/scripts.php"; ?>
<?php include "funcoes.php"; ?>
</head>
 
<body>
<body>
 
<div id="box">
  <div id="header">
    <div id="header_topo">
        <a href="index.php"><img src="images/qui-logo.png" alt="Home" title="home"/></a>
        <ul>
        <li><a href="index.php?pg=cidades">Comprar</a></li>
        
        <li><a href="index.php?pg=anunciar">Cadastrar</a></li>
        <li><a href="index.php?pg=contatos">Contatos</a></li>
        </ul>
         </div>        
       
    </div>
 
    <section id="corpologin">  
    
    
        
               <fieldset>
                    <legend>Fazer Login</legend>
                <form name="central_anunciante" action="<?php echo $loginFormAction; ?>" method="POST">
                    <label>  
                    <input type="text" name="usuario" placeholder="Digite seu E-mail" required pattern="[a-z0-9._%+-][email protected][a-z0-9.-]+\.[a-z]{2,4}$"/> </label>
                    <label> <span class="senha_txt"></span> 
                    <input type="password" name="senha" class="senha" placeholder="Digite sua senha"required="required" maxlength="100" />
                    <p><a href="index.php?pg=contatos">Esqueci minha senha</a></p> 
                     </fieldset>                    
                  <fieldset id="btn">
                    <input type="submit" name="Enviar" Value="Entrar" class="btn"/>
                   </fieldset> 
                    </label>  
                    </form>
   </section>             
                
</div>              
      <footer id="rodape">
     
      </Footer>      
 </body>      

 

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