Programmatically Create Category and sub Category and sub sub Category

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When you trying to insert child categories you are looking for term_exists() to return an array with a key term_id.

Following the documentation for term_exists

Return Values

(mixed)

  • Returns 0 or NULL if the term does not exist.
  • Returns the term ID if no taxonomy was specified and the term exists.
  • Returns an array if the parent exists. (format: array(‘term_id’=>term id, ‘term_taxonomy_id’=>taxonomy id))

It seems that you are missing the third argument for term_exists() and this is the ID of the previously inserted category which will be parent.

Hope that helps!