WordPress Custom Fields, Meta Boxes, and Meta Data.

Custom Fields

• David Hayes. How to Create and Use WordPress Custom Fields. wpshout, 2019.
• Daniel Pataki. Creating Custom Fields Manually in WordPress. wpmudev, 2016.
• Josh Pollock. Adding Custom Fields to WordPress Programmatically. envatotuts, 2014.
• William Craig. Enhancing WordPress Custom Fields with Search Filtering. webfx.
• Josh Pollock. Using the WordPress Custom Field User Interface. envatotuts, 2014.
• Rachel McCollin. WordPress Development for Intermediate Users: Custom Fields and Metadata. wpmudev, 2016.

Meta Boxes

• Narayan Prusty. Adding Custom Meta Boxes to the WordPress Admin Interface. sitepoint, 2015.
• Collins Agbonghama. Adding Meta Boxes to Post Types in WordPress. sitepoint, 2017.
• Carlo Daniele. Creating Custom Post Meta Boxes in WordPress. wpmudev, 2017.
• Tom McFarlin. Creating Maintainable WordPress Meta Boxes Series. envatotuts, 2014.
  • Part 1.
  • Part 2: The Layout.
  • Part 3: The Front-End.
  • Part 4: Finish the Front-End.
  • Part 5: Verify and Sanitize.
  • Part 6: Save and Retrieve.
  • Part 7: Refactoring.
• WordPress Meta Boxes: A Comprehensive Developer’s Guide. Theme Foundation, 2013.
• Tom McFarlin. Two Ways to Save Meta Box Data in WordPress. 2014.
• Tom McFarlin. WordPress Meta Boxes. 2014.
  • Part 1: Aiming for Simplicity.
  • Part 2: Separating the Logic.
  • Part 3: Each Component.
  • The Front End.

Meta Data

• Fred Meyer. How to Create and Use WordPress User Metadata (User Meta). wpshout, 2019.
• Josh Pollock. Mastering WordPress Meta Data Series. envatotuts, 2014.
  • Part 1: An Introduction to Meta Data
  • Part 2: Querying Posts and Users by Meta Data
  • Part 3: Understanding and Using Arrays
  • Part 4: Working with Loops.
• Tom McFarlin. WordPress Meta Data. 2015.
  • Use IDs (Not Titles).
  • Other Data (Not IDs).