get_declared_interfaces - PHP code example

The php Function Get Declared Interfaces

In PHP, interfaces are a form of reusability. They allow you to encapsulate functionality and then pass that functionality to other classes in your application. This allows you to write classes that will behave the same way regardless of what they are actually doing underneath.

Using interfaces in this manner is one of the most powerful things you can do in your code. However, there are some issues that can come up when you use them. For example, when you inherit a class from an interface, the parent class will need to implement all of the functions that are defined in that interface. This can be a pain when you have a lot of different interfaces that your class implements.

Fortunately, there is a solution to this issue. The php function get_declared_interfaces can be used to find out all of the interfaces that a class has declared. This function will return an array with the names of all of the interfaces that are declared in a class. The get_declared_interfaces function takes no parameters and returns an array of interfaces that are declared in the current script.

The get_declared_interfaces() function will also return an array of property accessors that are declared in the class. The property accessors are what allow a class to implement the functionality in an interface. For example, the property accessors will tell the class whether a property is read-write, read-only, or not set. This is important because it will let the class know how to get and set a specific property in the interface.

get_declared_interfaces example

$prev = [];

        try {
            while ($prev !== $classes) {
                $prev = $classes;
                foreach ($classes as $c) {
                    if (!isset($preloaded[$c])) {
                        self::doPreload($c, $preloaded);
                    }
                }
                $classes = array_merge(get_declared_classes(), get_declared_interfaces(), get_declared_traits());
            }
        } finally {
            restore_error_handler();
        }

        return $preloaded;
    }

    private static function doPreload(string $class, array &$preloaded): void
    {
        if (isset($preloaded[$class]) || \in_array($class, ['self', 'static', 'parent'], true)) {