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ReflectionExtension::__construct() is a PHP built-in class method that is used to create a new instance of the ReflectionExtension class. This method allows you to obtain information about an extension in PHP.

The constructor for ReflectionExtension takes a single parameter, which is the name of the extension that you want to reflect upon. It returns a ReflectionExtension object that you can use to access various information about the extension, such as its name, version, functions, constants, and other details.

Here is an example of how you can use the ReflectionExtension::__construct() method:

php
$extension = new ReflectionExtension('mysqli');


In this example, we create a new instance of the ReflectionExtension class and pass the name of the 'mysqli' extension as the parameter. This will create a ReflectionExtension object that represents the 'mysqli' extension in PHP.

You can then use this object to access information about the extension. For example, to get the name of the extension, you can use the getName() method:

php
echo $extension->getName(); // Output: mysqli


Similarly, you can use other methods provided by the ReflectionExtension class to get additional information about the extension.

Note that ReflectionExtension::__construct() is a part of PHP's Reflection API, which provides a set of classes to obtain information about functions, classes, extensions, and other aspects of PHP code at runtime. The Reflection API can be useful in various scenarios, such as dynamic code analysis, debugging, and generating documentation.