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Searching keywords from websites

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Whilliam
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Hey guys, I want to know how to program a search engine that looks for keywords from different websites. I know how to program search engines themselves if you're searching specific items from your website. What I want to know is searching for specific words all over the internet. E.g. is google but google is too complicated for me. I only want the concept. I tried searching in google.com but all I found are codes and "what programming language was google programmed". Most of them are python and complicated java. I only know php, c and a little bit of Java. Can anyone help me or direct me to a website that can help me? Yeah, I chose the php category because I'm planning to implement this in php if it's possible.

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cereal
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In practice you need a web crawler and from that the ability to search contents, there are some ready solutions for these tasks, you can check for Sphider: http://www.sphider.eu/docs.php#commandline

Or read here: http://www.daniweb.com/web-development/php/threads/365235/create-a-php-spider

bye!

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