PHPCR is a standard interface for content repositories that provides a common API for working with content stored in different backend systems. It defines interfaces for accessing and modifying a content repository using a tree structure with nodes, properties, queries, versioning and more. PHPCR also includes PHP scripting bindings, allowing applications to interact with repositories directly from PHP code through a standard interface.

1. PHPCR
Standard Interface for Content Repositories

2. http://bergie.iki.fi
henri.bergius@iki.fi
@bergie

3. github.com/bergie/noflo
github.com/bergie/phpflo

4. Same API, multiple repositories
●
Jackalope ●
Midgard
●
Apache Jackrabbit: ●
GObject-oriented
Java-based repository repository library
server, accessible accessible through
through WebDAV PHP extension
●
Doctrine: pure-PHP ●
Python, JavaScript,
repository library Java, ...
●
github.com/jackalope/jackalope ●
github.com/bergie/phpcr-midgard2

5. Why use Midgard?

6. Developers write against a single API
Implementations can be chosen based on
deployment needs

7. “Products in MySQL, blog entries in CouchDB”

8. Standard: JSR-283
Day Management AG, Switzerland 10-August-2009
Release note
Product: Specification for
Content Repository for Java(tm) Technology API 2.0
Version: 2.0
Type: Full Release
----------------------------------------------------------------------
This package consists of the following components:
1) Specification documents: spec/
2) Applicable Licenses: license/
3) API Source code: src/
4) pre-built API .jar-file: lib/
5) generated javadoc: docs/
For questions or comments feel free to use jsr-283-comments@jcp.org
Further information about JSR 283 can be found at
http://www.jcp.org/en/jsr/detail?id=283

9. Content Management
Interoperability Services
● JCR-like API using HTTP and
Atom (or SOAP)
● Quite complicated, but
language-agnostic
● OASIS spec since 2010
● Good implementations in
enterprise document
management systems
● Proponents include Microsoft,
Nuxeo and Alfresco

10. The next version of JCR will also include
PHP scripting bindings, i.e. PHPCR

11. PHPCR is a collection of interfaces

12. ...and API tests
bergie@AirDrone:~/Projects/phpcr-midgard2/api-test$ phpunit
PHPUnit 3.5.5 by Sebastian Bergmann.
I.IIISSSSSSSSS..S.............E..ESSSSSSSSSSSSSSSSSSSSSSSSEE 60 / 552
.........FFSSSSSSSSSSSSS.....E...........................I.. 120 / 552
EEI...EEEE......F..........F..........F..........F.......... 180 / 552
F..........F..........F......................F..........F... 240 / 552
.......F..........F..........F........ES.............S...... 300 / 552
....F.EE..I...E..II......F..............................I... 360 / 552
..........E.I..I.........I............................E.E... 420 / 552
...EE.............................E......................... 480 / 552
........I....................E.EFEF...I.I.IEI..FEE.FF.FFF..F 540 / 552
S.....SSSSSS
Time: 03:53, Memory: 148.50Mb
There were 27 errors:
1) PHPCRTestsQueryQueryManagerTest::testGetQuery
PHPCRQueryInvalidQueryException: Unsupported 'xpath' language
/home/bergie/Projects/phpcr-midgard2/src/Midgard2CR/Query/QueryManager.php:24
/home/bergie/Projects/phpcr-midgard2/src/Midgard2CR/Query/QueryManager.php:62
/home/bergie/Projects/phpcr-midgard2/api-
test/suite/tests/06_Query/QueryManagerTest.php:37
...
FAILURES!
Tests: 536, Assertions: 2331, Failures: 25, Errors: 27, Incomplete: 18, Skipped: 56.

13. Repository capabilities
●
Tree access ●
XML import and
●
Access by UUID export
●
Workspaces
●
Permissions
●
Versioning
●
Capability discovery
●
Multi-value properties
●
Observation
●
Queries: SQL2, QOM
●
Locking &
Transactions

14. “Simple stuff should be easy, but complex stuff
should still be possible”

15. In PHPCR, all content is stored in a tree of nodes
Nodes have a name, a type, and a set of
properties
Nodes can also have child nodes

16. Including PHPCR in your application
●
PHP 5.3 namespaced code
●
Use PSR-0 standard autoloader

17. Connecting to a repository: Midgard

18. Connecting to a repository: Jackrabbit
●
Start Jackrabbit:
$ java -jar jackrabbit-standalone-2.2.5.jar
●
Connect to repository:

19. This is the only repository-specific part

20. Working with the tree

21. About Node types
● Node types determine what properties and what kind of
child nodes a node can have
● Some built-in types: nt:file, nt:folder, nt:resource,
nt:unstructured
● Node types can be amended with “mixin” types, like
mix:lastModified, mix:language
● Most repositories allow you to define your own types
● Recommendation:
Start with nt:unstructured, add more strict definitions
when you know your data model

22. Queries: SQL2

23. Queries: Query Object Model

24. Versioning: enable

25. Versioning: commit

26. Versioning: restore

27. Export and import

28. Export and import

29. Some projects looking at PHPCR

30. Some projects looking at PHPCR

31. Questions?
henri.bergius@iki.fi
@bergie