How to automate OpenVZ with php

Question

Can anyone help me with automating OpenVZ containers with PHP? I have tried some methods but couldn't make the shell commands work with PHP.

Following methods that I tried:

1. Function like shell_exec(),exec() with and without sudo.

2. Create a PHP script to execute vzlist and executed with cron jobs as root but no luck.

3. Edited sudoers

4. Tried this: Execute root commands via PHP but still it do not work when i open file php file that run php_shell.sh in browser.

Anyone have any ideas?