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PHP > Tips and Tutorials > Miscellaneous
Oct 15, 2006
Prakash
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The singleton design pattern is a way of enforcing only one instance of an object. This is achieved by making 3 fairly simple steps to a class. Firstly making the constructor private, creating a static member variable that will contain the instance and then creating a static method for accessing the instance.
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Many have probably heard much about LDAP, but have no idea what it is or how it works. I will not attempt to teach everything there is to know about LDAP, but here is a brief description of the protocol.
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PageRank is a family of algorithms for assigning numerical weightings to hyperlinked documents (or web pages) indexed by a search engine. Its properties are much discussed by search engine optimization (SEO) experts. The PageRank system is used by the popular search engine Google to help determine a page's relevance or importance. As Google puts it:
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Copy paste this code into a new file called something you'll remember, for example, install.php
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Sit back, relax, and imagine this. You run a huge international movie database site. And, your database software is MySQL. You want visitors of your site to be able to rate movies, so that you can rank the movies. Here's how to get started...
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