Did you see any error in building matching PHP? It is recommend that EasyApache Integration be enabled in WHM/LSWS plugin and run EasyApache afterwards. This way, every time you run EasyApache, matching PHP will be built for LSWS automatically.
There are two ways to verify PHP in lsws:
1. From command line
2. Create a phpinfo php (with content "<?php phpinfo(); ?>"), then point your browser to that page.
BTW, suPHP is not supported in LSWS.