Dynamic description meta tag with php?

Namibnat

New member
This is a very theoretical question, but I would like to have some informative opinions:

I am busy starting a blog from scratch and would like to know about dynamic meta tags for blogs. What I want to do is to change the description meta tag for each blog post individually. I am NOT asking how to do it, I would like to know:

1. Does it help with SEO - I am not really thinking in terms of getting to the top of the search in Google, but rather that someone who is searching sees what the post is about when they do find it.
2. Should I do something like this - ....content="<?php echo 'Blogname, ' . $posttitle>", or just the title, or do I need to create a little description each time separately...what is the best way to do it.
3. How does Google actually choose the little description that goes with the title in each search category. I seem to remember that it doesn't always match the meta description. Does anyone have any thoughts on how that works.

The main thing that I am concerned with is that you don't find some search query that has a bunch of nonsense, or on the other hand, just the plain description of my blog. I want something that appears professional each time a query is made. I am mainly concerned with Google (who isn't) and how it looks in their search results.
 
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