PHP Summarize any URL

How can I, in PHP, get a summary of any URL? By summary, I mean something similar to the URL descriptions in Google web search results.

Is this possible? Is there already some kind of tool I can plug in to so I don't have to gene开发者_JAVA百科rate my own summaries?

I don't want to use metadata descriptions if possible.

-Dylan

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What displays in Google is (generally) the META description tag. If you don't want to use that, you could use the page title instead though.

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If you don't want to use metadata descriptions (btw, this is exactly what they are for), you have a lot of research and work to do. Essentially, you have to guess which part of the page is content and which is just navigation/fluff. Indeed, Google has exactly that; note however, that extracting valuable information from useless fluff is their #1 competency and they've been researching and improving that for a decade.

You can, of course, make an educated guess (e.g. "look for an element with ID or class maincontent" and get the first paragraph from it) and maybe it will be OK. The real question is, how good do you want the results to be? (Facebook has something similar for linking to websites, sometimes the summary just insists that an ad is the main content).

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The following will allow you to to parse the contents of a page's title tag. Note: php must be configured to allow file_get_contents to retrieve URLs. Otherwise you'll have to use curl to retrieve the page HTML.

$title_open = '<title>';
$title_close = '</title>';

$page = file_get_contents( 'http://www.domain.com' );
$n = stripos( $page, $title_open ) + strlen( $title_open );
$m = stripos( $page, $title_close);

$title = substr( $page, n, m-n );

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While i hate promoting a service i have found this:

embed.ly

It has an API, that returns a JSON with all the data you need.

But i am still searching for a free/opensource library to do the same thing.