A basic example of how a core PHP class like SoapClient cannot be created as a proxy.

proxy.php

<?php

$config  = new \ProxyManager\Configuration(); // customize this if needed for production
$factory = new \ProxyManager\Factory\LazyLoadingValueHolderFactory($config);

$proxy = $factory->createProxy(
    'SoapClient',
    function (& $wrappedObject, $proxy, $method, $parameters, & $initializer) {
        $wrappedObject = new \SoapClient('http://www.blah.com'); // instantiation logic here
        $initializer   = null; // turning off further lazy initialization

        return true;
    }
);