Fix PHP Error when Term Taxonomy points to non-existing term_id #560
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Description:
If term has been deleted from
terms
table but reference to it left interm_taxonomy
table, it throws a PHP error when trying to reach$post->terms
attribute.Since there are no foreign keys in WP tables, additional checking in code is needed.
Steps To Reproduce:
PHPUnit test is included in commit.
Create a Taxonomy with term_id = 0 and attach to the Post, try to get $post->terms attribute.