P A R T V
Back-End Development
Chapters 18, 19, and 20 form one unit, originally written as one chapter, covering everything you need to know to get started writing your own modules.
Chapter 21 covers porting a Drupal 6 module to Drupal 7, which can be a great way to learn module development.
Chapter 22 provides another good onramp to writing modules—“glue code,” or site-specific modules, to make the final tweaks you cannot quite achieve with configuration. This chapter can be read without reading any of the previous chapters first.
Chapter 23 covers writing tests for your module, an essential part of reliable and sustainable code.
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