In PHP 5+, objects are passed by reference. This has got me into trouble in the past when I've tried to make arrays of objects. For example, I once wrote something like the following code, thinking that I'd get an array of distinct objects. However, this is wrong. This code will create an array of multiple references to the same object.
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PHP File Extensions . File extension and Tags In order for the server to identify our PHP files and scripts, we must save the file with the “.php” extension.Older PHP file extensions include .phtml.php3.php4.php5.phps; PHP was designed to work with HTML, and as such, it can be embedded into the HTML code.