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copied!<p>An example singleton classes in php:<br/> <a href="https://stackoverflow.com/a/203359/858515">Creating the Singleton design pattern in PHP5 : Ans 1 :</a><br/> <a href="https://stackoverflow.com/a/1939269/858515">Creating the Singleton design pattern in PHP5 : Ans 2 :</a></p> <p><code>Singleton is considered "bad practice".</code></p> <p>Mainly because of this: <a href="https://stackoverflow.com/questions/5283102/how-is-testing-registry-pattern-or-singleton-hard-in-php/5283151#5283151">How is testing the registry pattern or singleton hard in PHP?</a></p> <blockquote> <ul> <li><p><a href="http://www.slideshare.net/go_oh/singletons-in-php-why-they-are-bad-and-how-you-can-eliminate-them-from-your-applications" rel="nofollow noreferrer">why are singleton bad?</a></p></li> <li><p><a href="http://blogs.msdn.com/b/scottdensmore/archive/2004/05/25/140827.aspx" rel="nofollow noreferrer">why singletons are evil?</a></p></li> <li><p><a href="http://fabien.potencier.org/article/11/what-is-dependency-injection" rel="nofollow noreferrer">A good approach: Dependency Injection</a></p></li> <li><p><a href="http://fabien.potencier.org/talk/19/decouple-your-code-for-reusability-ipc-2008" rel="nofollow noreferrer">Presentation on reusability: Decouple your PHP code for reusability</a></p></li> <li><p><a href="http://fabien.potencier.org/article/12/do-you-need-a-dependency-injection-container" rel="nofollow noreferrer">Do you need a dependency injection container</a></p></li> <li><p><a href="http://www.phparch.com/2010/03/static-methods-vs-singletons-choose-neither/" rel="nofollow noreferrer">Static methods vs singletons choose neither</a></p></li> <li><p><a href="http://www.youtube.com/watch?v=-FRm3VPhseI" rel="nofollow noreferrer">The Clean Code Talks - "Global State and Singletons"</a></p></li> <li><p><a href="http://martinfowler.com/articles/injection.html" rel="nofollow noreferrer">Inversion of Control Containers and the Dependency Injection pattern</a></p></li> </ul> </blockquote> <p>Wanna read more? :</p> <blockquote> <ul> <li><p><a href="https://stackoverflow.com/questions/3124412/what-are-the-disadvantages-of-using-a-php-database-class-as-singleton/3124428#3124428">What are the disadvantages of using a PHP database class as a singleton?</a></p></li> <li><p><a href="https://stackoverflow.com/questions/3272090/php-pdo-database-abstraction-class-design-question/3274863#3274863">Database abstraction class design using PHP PDO</a></p></li> <li><p><a href="https://stackoverflow.com/questions/3870635/would-singleton-be-a-good-design-pattern-for-a-microblogging-site/3870710#3870710">Would singleton be a good design pattern for a microblogging site?</a></p></li> <li><p><a href="https://stackoverflow.com/questions/4244437/modifying-a-class-to-encapsulate-instead-of-inherit/4244824#4244824">Modifying a class to encapsulate instead of inherit</a></p></li> <li><p><a href="https://stackoverflow.com/questions/3820103/how-to-access-an-object-from-another-class/3820286#3820286">How to access an object from another class?</a></p></li> <li><p><a href="http://sebastian-bergmann.de/archives/882-Testing-Code-That-Uses-Singletons.html" rel="nofollow noreferrer">Testing Code That Uses Singletons</a></p></li> </ul> </blockquote> <p><strong><em>A Singleton decision diagram (<a href="https://stackoverflow.com/a/4596323/208809">source</a>):</em></strong></p> <p><img src="https://i.stack.imgur.com/Dzdio.png" alt="Singleton Decision Diagram"></p>

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