Is it worth making a CMS from scratch? [closed]

Question

I am about half way through coding my own Php Content Management System from scratch, but now I am nearing the end of coding new features and making it look good and am now being faced with the big issue of security. I know little about the security side of Php except the fact that it is very vulnerable with SQL injection etc. Let's just say my website was going to have loads of user generated content and be like facebook, is that something one person could secure by themselves or am I better off paying someone to do it for me? if so, anyone know how much that would cost?

Any feedback would be greatly appreciated.

Update: Any opinions on http://www.incapsula.com ?

Answer 1

With so many mature PHP CMS systems available, the only reasons I can think of for writing one of your own would be as an exercise (to learn something), as a challenge (to see if you could), or if you needed some specific feature that the existing ones didn't have. Even if you did want a special feature, I'd still look at extending an existing CMS rather than writing one from scratch - many of them cater for modules and / or plug-ins.