Hello, I have over 10 years of experience with PHP and am fully aware of all the new features of 5.6 and also the deprecated ones(since it's a bad practice to use them anymore and they require refactor anyway), thus I can assure you it will be an easy task for me. Also currently my main line of work is a big php project(a Rest API based, which is private but I can provide you with my github profile for you to see my public work instead). I am sure my speed will be up to your liking.
Best regards and I will be waiting for you to contact me.