Customers often ask how to find out what PHP code is being called. Sometimes, they're looking to find abusers of PHP email forms - and other times, they're interested in learning which routines are being called the most often.
The following monitoring command will run until you interrupt it with a control-C.
lsof +r 1 -p `ps axww | grep [h]ttpd | awk '{ str=str","$1} END {print str}'`|grep vhosts|grep php
It takes the process IDs of all of the Apache processes and strings them together with commas inbetween. Then it calls "lsof", asking it to repeat every second.
"lsof" lists all of the open file descriptors for the processes listed after the "-p" argument.
At the end of the command, we select only those lines that have "vhosts" and "php". If your website document roots aren't under /var/www/vhosts you will want to look for some other string indicating "a file within a website"
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