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Originally Posted by postUre
Can I add PHP and SSI Includes to an HTML site that uses cascading style sheets ?
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Of course. No difference.
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Originally Posted by postUre
Do they cause any SEO problems,, or problems for crawlers?
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Some crawlers do not crawl pages which are called with parameters. So if you use constructions like
http://www.domain.com/index.shtml?introduction
or
http://www.domain.com/index.php?query=introduction
some spiders recognize by the "?" that this is a dynamically generated page and may not spider it. Googlebot will sometimes spider such pages, for the others I don't know how they currently handle this.
You can circumvent that with rewriting, how, depends on whether you are on an apache or IIS server.
BTW: If you are on IIS, forget SSI. IIS supports only a fraction of SSI. In this case, use PHP.
PHP may be the better solution anyway, since you simply have more options - you can add any code you want. Want a dynamically created menue? No sweat. etc. etc.
Most of my sites rely heavily on SSI/PHP/CGI and sometimes use extensive URL rewriting. I have not noticed any problems with crawlers so far.
Only problem could be caching, but that's another story ...
Alex