PHP创建新类实例停止加载页面（CentOS）

I created a PHP login portal in a local computer running XAMPP v1.8.2-3 and it was working fine, but when I uploaded it in a CentOS 6.6 (Final) which I also use for other PHP stuff, it was not working at all.

I noticed that when right after I create a new class instance "$user = new User()" the page will stop loading with no errors.

I am I missing a package or something?

php.i686                5.3.3-46.el6_6    @updates
php-cli.i686            5.3.3-46.el6_6    @updates
php-common.i686         5.3.3-46.el6_6    @updates
php-mysql.i686          5.3.3-46.el6_6    @updates
php-pdo.i686            5.3.3-46.el6_6    @updates
php-xml.i686            5.3.3-46.el6_6    @updates
mysql.i686              5.1.73-3.el6_5    @base
mysql-libs.i686         5.1.73-3.el6_5    @anaconda-CentOS-201410241409.i386/6.6
mysql-server.i686       5.1.73-3.el6_5    @base
httpd.i686              2.2.15-39.el6.centos
httpd-tools.i686        2.2.15-39.el6.centos

Code:

require_once('core/init.php');

echo "before $user = new user()";

$user = new user();

echo "After $user = new user()";

<form action="" method="post">
</form>

Browser Result:

before $user = new user()