How to create a PHP technical blog on sitepoint or somewhere else?

Seems creating a technical blog is important for a developer, who to create one? On sitepoint?

Not sure what you are asking. Are you looking for ideas on what to blog about? Or are you looking for somewhere to host a blog?

some where to host my personal tech blog

The SitePoint forums are not a blog. But SitePoint has a blog and perhaps you could write for them