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I am having some issues with character encoding on imported posts from an old Wordpress install. I am getting black diamonds with question marks on some of the posts I have imported to a new install. The issue only seems to exist in post excerpts, when I click to view the full post, the missing characters are not there and when I click "edit post" they are not visible in the backend either. I have found several topics regarding this issue, but none of the solutions have worked for me so far.

The new install is using define('DB_CHARSET', 'utf8mb4'); in wp-config.php whereas the old site(where I imported the posts from) is using define('DB_CHARSET', 'utf8');

I'm not sure what character is even having trouble being encoded. I think it's just an nbsp; but there are other places with nbsp; that are not showing as question marks, so I'm stumped. Any quick remedy for this issue?

Things I have tried:

  • Commenting out define('DB_CHARSET', 'utf8mb4'); and define('DB_COLLATE', ''); (This created even more question marks)
  • Adding <meta content="text/html; charset=UTF-8" http-equiv="Content-Type"> to header.php
  • Setting back to define('DB_CHARSET', 'utf8'); in the wp-config.php
  • Have you tried setting the define back to UTF-8, along with the database? – Mat May 7 '18 at 20:06
  • I tried setting the define back to UTF-8, but the problem persisted. I'm not sure how to safely make the change to the database, since the database seems to be using a mix of encodings(for example, I have tables from a plugin using utf8_general_ci, whereas the default Wordpress tables are using utf8mb4_unicode_520_ci). – user13286 May 7 '18 at 20:09
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    Take a backup of your database then look at dba.stackexchange.com/questions/94789/… – Mat May 7 '18 at 20:46
  • Have you checked the database is actually using that encoding? define( 'DB_CHARSET', 'emoji' ); won't change your tables retroactively. Or that the version of MySQL you're using actually supports utf8mb4 – Tom J Nowell May 7 '18 at 21:41

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