中的参数说明the Codex entry for wp_insert_post() has exactly what you need (reformatted).

\'post_category\'  => [ array(<category id>, <...>) ] 
//post_category no longer exists, try wp_set_post_terms() for setting a post\'s categories

wp_set_post_terms( $post_id, array( 1, 2, 3), \'category\', true );

\'tax_input\' => array( 
  \'taxonomy_name\' => array( 
    \'term\', 
    \'term2\', 
    \'term3\' 
  ) 
); // support for custom taxonomies. 

Codex弱暗示您不能再通过wp_insert_post(). 然而，虽然我还没有测试过它，但如果tax_input 参数也适用于category 分类法，如：

\'tax_input\' => array( 
  \'category\' => array( 
    \'a\', 
    \'b\', 
    \'c\' 
  ) 
);

Worked for me with wp_set_object_terms()