We've released DTrace-enabled PHP 5.5.4 RPMs to make testing DTrace on Oracle Linux easier. As a result, the manual PHP install steps listed in Using PHP DTrace on Oracle Linux can be skipped. There are updated Betas of the "UEK3" Linux Kernel 3.8.13-16 and the dtrace-utils tools available too. With these, you now can DTrace PHP applications under Apache or with php-fpm, as well as command line PHP scripts.
He includes the full instructions on how to install the Oracle Linux distribution and grab the Oracle Instant Client libraries used for the "playground" packages. Next up is the PHP install - a quick call to yum - and a simple script showing how to set DTrace probe. Some sample output of the trace is shown and an slight modification to the probe showing how to find only calls from a certain source.