使用register_shutdown_function:

function shutdown()
{
    echo 'Script executed with success', PHP_EOL;
}

register_shutdown_function('shutdown');

或者__destruct():

class MyDestructableClass {
   function __construct() {
       print "In constructor\n";
       $this->name = "MyDestructableClass";
   }

   function __destruct() {
       print "Destroying " . $this->name . "\n";
   }
}

$obj = new MyDestructableClass();