<?php
$m = new mongo();
$c = $m->demo->so;

$c->insert( array(
	'_id' => new MongoId( "4fcdb3b8749d786c03000002"),
	'email' => 'foo@bar.com',
	'folder' => array(
		'root' => array(
			'feeds' => array(
				array(
					'feedId' => new MongoId("4fcdaa9e749d786c03000001"),
					'title' => 'title.com',
				),
				array(
					'feedId' => new MongoId("4fcdaa9e749d786c03000002"),
					'title' => 'title.com/the2nd',
				),
			),
			'title' => 'root',
		)
	),
	'status' => 1,
	'username' => 'foouser',
) );

$c->update(
	array( 'username' => 'foouser' ),
	array( '$pull' =>
		array( 'folder.root.feeds' =>
			array(
				'feedId' => new MongoId('4fcdaa9e749d786c03000001'),
				'title' => 'title.com',
			)
		)
	)
);

var_dump( $c->findOne( array( 'username' => 'foouser' ) ) );