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In Part 3 of this series on developing efficient PHP code in real-world situations, Amol Hatwar discusses how to build the most efficiently functional functions, functions you can use without sacrificing too much performance or manageability. The author focuses on writing reusable functions and covers how to avoid the most common problems associated with this task. Read Develop rock-solid code in PHP: Write reusable functions, Part 3 here. (http://www.opensourcetutorials.com/tutorials/Server_Side_Coding/PHP/rock-solid-code-part-3/page1.html)