Fatal Error Database

I was installing a site, after all I open the site and I come across this error:

  

Fatal error: Uncaught Error: Call to undefined function mysql_select_db () in /home/imwfzgbi/public_html/config/config.php:19   Stack trace: # 0 /home/imwfzgbi/public_html/index.php(15): include () # 1 {main} thrown in /home/imwfzgbi/public_html/config/config.php on line 19

Config.php:

<?php
    $siteA = 'http://'.$_SERVER['SERVER_NAME'].'/';
    $siteB = '/';
    $email_suporte_staff = '[email protected]';

    global $siteB;
    global $siteA;

    $config_bd = array(
        'host' => 'localhost',
        'db' => 'imwfzgbi_ultra',
        'usuario' => 'imwfzgbi_flix',
        'senha' => 'ultraflixbr',
    );

    $conect = mysql_connect($config_bd['host'], $config_bd['usuario'], $config_bd['senha']);
    if($conect)
    {
        mysql_select_db($config_bd['db']);
        mysql_set_charset('utf8');
    }
    else
    {
        echo '<center><b>config/config.php</b> nao configurado.</center>';
        exit;
    }
?>

These are the files with the supposed error. Can anyone help me?