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I have this little code to insert posts via custom form:

 $post = array(
     'post_author' => 1,
     'post_title' => 'my title,
     'post_content' => 'my content',
     'post_category' => array(3),
     'post_type' => 'post',

if ( $post_id = wp_insert_post( $post ) ){
    echo 'post added!';

but now I need to insert the last $post_id to term_relationships table,

basic scheme of term_relationships:

object_id | term_taxnomy_id | term_order

Wordpress have a function to update that table?, or I need to build a custom query?

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up vote 2 down vote accepted

Check this wp_set_object_terms().

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