Looking for WordPress System Diagrams

2 comments

1. ^{More than an Answer, this is a research and a compilation. Database Description already in Damien answer.}

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   A Google search reveals this in WordPress forums:

   UML of WordPress MU?
   There will likely never be UML diagrams of WordPress because it’s not
   an OO system. Some parts are OO-like, but overall it’s whatever that
   particular code contributor made work. There’s no map, just code.

   And IMO, the point of UML is that it’s done in the architecting phase.
   A project like WordPress would be hard-pressed to have this since it’s
   a fluid integration of independent developers contributing to the
   core.
   […]

   Welcome to open source.

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   Note: the Template Hierarchy of WikiMedia in the OP Question differs from the one in the Codex
   
   ^{click to enlarge}

   But, Chip Bennet has an extended one 🙂
   

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   I thought this Question was a duplicate of the following (but mods said it’s not):
   Where can I find a real architecture document on WordPress?

   In it, Mike Schinkel states:

   These generally are not some the open-source WordPress community focuses on doing.

   One answer points to an old article with this diagram:
   

   And the other to this WordPress 3.0 Program Flow (PDF)
   

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   Rarst answer to this Question ( When should you use WP_Query vs query_posts() vs get_posts()? ) has a nice overview of WP_Query:
   

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   Another from Rarst on core load:

   

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   And finally, a totally unrelated Question about performance ( Refactoring WordPress to improve memory performance ), but with very nice graphs 🙂
   

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2. If you are looking for the database schema, there is a version on the Codex:
   

   ^{click to enlarge}

   The image you referenced in your post is the template hierarchy most commonly used by theme developers.

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