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Yaf_View_Simple::__isset is a method in the PHP framework YAF (Yet Another Framework). It is used to determine if a specific property exists in the Yaf_View_Simple object.

When you call the isset() function on a property of a Yaf_View_Simple object, PHP will invoke the __isset method of the object. This method is automatically called when the isset() function is used to check if a specific property exists in the object.

For example, if you have a Yaf_View_Simple object called $view, you can use isset() to check if a property called $property exists in the object:

if (isset($view->$property)) {
echo "The property exists!";
} else {
echo "The property does not exist!";
}

Inside the Yaf_View_Simple::__isset method, you can implement the logic to check if the property exists and return a boolean value accordingly. This method allows you to handle property existence checks in a customized way for Yaf_View_Simple objects.