What is wikipedia pageid? how to change it into real page url?

The pageid is the MediaWiki's internal article ID. You can use the action API's info property to get the full URL from pageid:

https://en.wikipedia.org/w/api.php?action=query&prop=info&pageids=18630637&inprop=url

Oh, and you can also get the full page URL in your initial API call if you add "&prop=info&inprop=url":

http://en.wikipedia.org/w/api.php?action=query&generator=search&gsrsearch=meaning&srprop=size%7Cwordcount%7Ctimestamp%7Csnippet&prop=info&inprop=url

You can just use a URL like this:

http://en.wikipedia.org/?curid=18630637

This is the shortest form, others are also possible:

http://en.wikipedia.org/wiki?curid=18630637

http://en.wikipedia.org/wiki/Translation?curid=18630637

http://en.wikipedia.org/w/index.php?curid=18630637

Note that MediaWiki ignores the page title if you specify a curid, so even

http://en.wikipedia.org/wiki/FooBar?curid=18630637

leads to the same page.

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