Over the years, PHP has been instrumental to progress in the field of web development. As one of the early pioneers of server-side web scripting, the PHP language grew to become the dominant programming language of open-source web applications. Its free and open-source codebase made it the default programming language on Apache and Linux, and the large number of excellent web applications built on PHP will secure its existence for at least the next fifteen years.
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The Singleton is one of the simpler design patterns. As the name suggests, the Singleton creates a single, static, globally accessible class. It is an alternative to global variables and static classes, each which come with their own limitations.
Singletons are excellent areas to store global information, such as database connection strings, system paths, and parsed XML configurations. In addition, Singletons can be used to store global image caches so that images can be shared between functions.
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During undergrad at Urbana-Champaign, one of the hot topics for search engine scientists was the “Deep Web”. While most of the web was easily accessible through HTML, a large portion of the dynamically generated content, such as PHP and ASP pages, could not be indexed by search engines.
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