One Story Every Day

1.Create a new post

$my_post = array();
$my_post['tags_input'] = $arrKeys;
$my_post['filter'] = true;
$my_post['post_title'] = $title;
$my_post['post_content'] = $body;
$my_post['post_excerpt'] = $excerpt;
$my_post['post_status'] = $status; //(pending/publish)
$my_post['post_author'] = 1; // admin

//Before WP 3.0
$my_post['post_category'] = $arrCategs;

$newPostId = wp_insert_post( $my_post );

//After WP 3.0
wp_set_post_terms($newPostId,$arrTagsId,'tags');
wp_set_post_terms($newPostId,$arrCategsId,'categories');

//Update post meta
update_post_meta($newPostId, $meta_key, $meta_value, $prev_value);

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