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Search Engine In Php

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So why then make your own search engine?



To make money of course!

... and to become famous as the creator of the next big search engine or because as a programmer or engineer you like challenges. Making a search engine for the public Internet is tricky and if you're like me you like to solve tricky problems.

The third application is a customized, high speed site search for you large

thousands of pages website. An indexed search engine will be a lot faster than

a full text search function and if Google's site search isn't flexible enough

for your site you can make your own search functionality.

THE BASICS OF SEARCH

The basis of any BIG search engine is a word to web page index, basically a long list of words and how well they relate to different web pages.

To make a search engine you have to do four things:

Decide what pages to fetch and fetch them

Parse out words, phrases and links from the page

Give a score to every keyword or key phrase indicating how well the phrase relates to that pages and store the scores in the search engine index

Provide a way for users to query the index and get a list of matching web pages

This is not hard for a seasoned programmer. It can be done in a day if you know regular expressions and have some experience with HTML and databases.

Now you have a working search engine, just add a lot of computers and hard drives and you'll soon index all of the Internet. If you're not prepared to go that far a one terabyte disk will hold an index of about 50 million pages.

HOW TO SCORE PAGES

After completing basic search functionality there's a lot of work before anyone will want to use your new machine.

An index is not enough. What's challenging is how to score pages to give the end user the search results that's most relevant to his idea of what hi is searching for.

You'll need to decide how much weight to put on keywords in the tile tag, description and main web page contents. To make good scoring you will also want to boost keywords found in the URL of the page and check the anchor text of inbound links.

Keeping track of inbound links is the most useful and most challenging of the above, you'll need to keep a separate database table with info on all links between pages you index.

WHAT TO INDEX AND NOT TO INDEX

Other obstacles you will find when you start indexing real Internet content is the fact that there is wast amounts of useless junk floating around everywhere and eventually your index will become full of spam, affiliate pages, parked domains, work in progress homepages without content, link farms used by search engine optimizers, mirror sites using data feeds to create thousands of pages with product listings or other reproduced content etc, etc...

When indexing from the Internet you will have to find ways to filter out the junk content from what people are actually reading and searching for.

To start with you could limit how deep into sub directories you crawl, how many link hops from a domain index page you crawl and how many links per web page to allow.

PARSING WEBSITES

There's a million ways, both right and wrong to write HTML and when you index from the Internet you will need to handle all of them.

When parsing keywords from pages you not only need to handle the complete HTML standard but also all the non-standard ways that is unofficially supported by Internet browsers.

To be able to read all pages you will also need to parse client side java script, handle frames, CSS and iframes.

This is a large part of the work on a general search engine, to be able to read all sorts of content.

WHY SO MANY URLS?

Finally you'll need to deal with the fact that many websites have many URLS pointing to the same web page. Just look at this example:

dmoz.org

www.dmoz.org

dmoz.org/index.html

www.dmoz.org/index.html

All those URLs point to the same web page. If you don't make special code to handle that you'll soon have 4 results in your search engine (one for every URL) all going to the same page. Users will not like you.

There is also the possibility of query strings where a session ID after the question mark in the URL will create almost infinite URLs for the same web page.

google.com?SID=4434324325325

google.com?SID=4387483748377

google.com?SID=7654565644466

To the search engine there will be a really big number of pages all containing the same content.

The quick fix of course is to not index pages that include a query string. Or to strip the query string from pages. This works but will also remove a lot of legitimate content (think forums) from your index.

You now have all the information you need to make a site search engine. If you're going for a general Internet search engine there's a lot more details you need to include. Like robots.txt, site maps, redirects, proxies, recognizing content types, advanced ranking algorithms as well as handling terabytes of data.

I'll cover more detail in a future article. Good luck with your next search engine project.
Search Engine In Php
It basically involves fine-tuning the content of your site along with the HTML and Meta tags and also involves appropriate link building process. The most popular search engines are Google, Yahoo, MSN Search, AOL and Ask Jeeves. Search engines keep their methods and ranking algorithms secret, to get credit for finding the most valuable search-results and to deter spam pages from clogging those results.

A search engine may use hundreds of factors while ranking the listings where the factors themselves and the weight each carries may change continually.

Algorithms can differ so widely that a web page that ranks #1 in a particular search engine could rank #200 in another search engine. New sites need not be "submitted" to search engines to be listed. A simple link from a well-established site will get the search engines to visit the new site and begin to spider its contents. It can take a few days to even weeks from the referring of a link from such an established site for all the main search engine spiders to commence visiting and indexing the new site.

If you are unable to research and choose keywords and work on your own search engine ranking, you may want to hire someone to work with you on these issues.

Search engine marketing and promotion companies, will look at the plan for your site and make recommendations to increase your search engine ranking and website traffic. If you wish, they will also provide ongoing consultation and reporting to monitor your website and make recommendations for editing and improvements to keep your site traffic flow and your search engine ranking high.

Normally your search engine optimization experts work with your web designer to build an integrated plan right away so that all aspects of design are considered at the same time.

It is the search engines that finally bring your website to the notice of the prospective customers. When a topic is typed for search, nearly instantly, the search engine will sift through the millions of pages it has indexed about and present you with ones that match your topic. The searched matches are also ranked, so that the most relevant ones come first.

Remember that a prospective customer will probably only look at the first 2-3 listings in the search results. So it does matter where your website appears in the search engine ranking.

Further, they all use one of the top 6-7 search engines and these search engines attract more visitors to websites than anything else. So finally it all depends on which search engines the customers use and how they rank your site.

It is found by surveys that a when customers want to find a website for information or to buy a product or service, they find their site in one of the following ways:

The first option is they find their site through a search engine.

Secondly they find their site by clicking on a link from another website or page that relates to the topic in which they are interested.

Occasionally, they find a site by hearing about it from a friend or reading in an article.

Thus it's obvious the most popular way to find a site, by search engine, represents more than 90% of online users. In other words, only 10% of the people looking for a website will use methods other than search engines.

All search engines employ a ranking algorithm and one of the main rules in a ranking algorithm is to check the location and frequency of keywords on a web page. Don't forget that algorithms also give weight to link population (number of web pages linking to your site).

A search engine is the most effective tool that can bring a prospective customer to your Company website. Millions of web visits are initiated daily through one or the other search engine to locate information or sources of supply. This is considered to be the most effective and targeted channel for you as a website owner to acquire a hot lead. Businesses all the over the world spend a huge sum on designing, building, maintaining and promoting their websites.

Online advertising and marketing budgets have also soared. Relative to these, the investment required for getting traffic through search engines is much lower. However, as search engines have millions of pages in their coverage, it is important to have a proper approach to using this channel effectively.

Before you begin to develop your own strategy and implementation plan to optimize your website for improved page ranking, you have to reflect on what is the major objective of this initiative. Is it your objective to attract more visitors to your site or convert more persons from being a visitor to a loyal stakeholder in your business?

The first step that advertisers and marketing professionals need to take to apply optimization techniques to a website is to articulate the objective and characterize the visitor, the desired visitor experience and outcome. The optimization plan should evolve out of this.

Search Engines provide you an effective vehicle for promotion of your website.
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About Author
Both Simon Byholm & Michael Sherriff are contributors for EditorialToday. The above articles have been edited for relevancy and timeliness. All write-ups, reviews, tips and guides published by EditorialToday.com and its partners or affiliates are for informational purposes only. They should not be used for any legal or any other type of advice. We do not endorse any author, contributor, writer or article posted by our team.

Simon Byholm has sinced written about articles on various topics from Cars, Computers and The Internet. Simon Byholm is building a new where he will test and describe new search algorithms. Simon is a software engineer living on the west coast of Fi. Simon Byholm's top article generates over 1600 views. to your Favourites.

Michael Sherriff has sinced written about articles on various topics from Site Promotion, Web Development and Education. The SEO Company offers a complete and right now you can get a comprehensive ranking report for your website for free by clicking. Michael Sherriff's top article generates over 22200 views. to your Favourites.
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