PHP Singleton Design pattern

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In singleton pattern we create a class that generates one and only one object instance. This video explain the singleton design pattern with php
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Thanks for the video, but I did not completely understand the comparison of globals with the singleton approach. How can globals be replaced with singletons? globals are accessible even in case of page reloads, but singleton instances are not, unless you are talking about storing the variables in session.

sandeepannits