Custom search page and search by title, content and tag

Search in WordPress is complicated matter because:

  1. WP doesn’t do it very well out of the box
  2. People tend to have varied expectations of how precisely search should work
  3. Even light (from human perspective) requirements for search tend to translate in complicated and involved code

Building search from scratch is involved (I know because I did exactly that for a while for clients) and you should totally look for search plugins or other compromise (like search as service) first.

To briefly enumerate specific issues with your code:

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