When is it necessary to implement a destructor for a class in PHP?

Destructor in PHP (__destruct()) is implemented in a class when it is necessary to perform certain actions upon object destruction, such as:

• Releasing resources (files, database connections, sockets).
• Closing open connections.
• Logging or cleanup.

Example:

class FileHandler {
    private $handle;

    public function __construct($filename) {
        $this->handle = fopen($filename, 'r');
    }

    public function __destruct() {
        if ($this->handle) {
            fclose($this->handle);
        }
    }
}

Here, the destructor ensures that the file will be closed when the object is destroyed.