I work for a very large ISP. When I get there I found that a lot of tools are done with PHP, and I'm not talking fancy PHP. mysql_, no APC, no framework, almost no objects, no web services etc.
The other day I was asked to do a cron task and I was able to do it with Zend Framework very quickly and quite elegantly. It was surely not the perfect tool but since it integrates with the culture of devs and sysadmin there it was certainly good enough and very maintainable.
