When an object is destroyed, such as when the last reference to an object is removed or the end of the script is reached, its destructor is called. Because PHP automatically cleans up all resources when they fall out of scope and at the end of a script’s execution, their application is limited. The destructor is a method called __destruct():
class Building
{
function __destruct()
{
echo "A Building is being destroyed!";
}
}