As of the 10th July 2016 php 5.5 is officially end of life, as a result it should not be used anymore. Any applications still using 5.5 should be upgraded to php 7 ideally or failing that 5.6 as a minimum.
5.5 was released in 2013, active support ended 10th July 2015, today security support has ended. Any vulnerabilities that may exist in 5.5 will NOT be patches any more and could leave your site vulnerable to attack.
If you host does not have 5.6 or higher I highly recommend you contact them and ask to be upgraded or find a better host.
Upgrading to 5.6 should be painless nearly everything works without changes, having said there there are some backward incompatible see migrating from 5.5 to 5.6
For the past 12 years, I’ve been developing applications for the web using mostly PHP. I do this for a living and love what I do as every day there is something new and exciting to learn.
In my spare time, the web development community is a big part of my life. Whether managing online programming groups and blogs or attending a conference, I find keeping involved helps me stay up to date. This is also my chance to give back to the community that helped me get started, a place I am proud to be apart of.
Besides programming I love spending time with friends and family and can often be found together going out catching the latest movie, staying in playing games on the sofa or planning a trip to someplace I’ve never been before.