wordpress - Automatically insert WordPress custom field

Question

I want to add a new custom field with a meta key and meta value to my posts.

Currently the only way it is added to a post is if I go into the post and click Update.
I have lots of posts and essentially want this custom field to be added to all posts automatically with an assigned meta value.

This meta value is different for each post.

Answer 1

我发现这很有帮助： http: //www.catswhocode.com/blog/wordpress-how-to-insert-data-programmatically

function add_custom_field_automatically($post_ID) {
global $wpdb;
if(!wp_is_post_revision($post_ID)) {
    add_post_meta($post_ID, 'field-name', 'custom value', true);
}
}
add_action('publish_page', 'add_custom_field_automatically');
add_action('publish_post', 'add_custom_field_automatically');

这将为 $post_ID 中的“字段名称”添加一个“自定义值”。

Answer 2

我认为正确的方法是使用'save_post'hook，例如：

  function cwp_add_custom_post_meta($post_id, $post){
global $wpdb;
$post_cat_id=get_the_terms( $post_id, 'category' );
$post_cat_id=cwp_object_to_array($post_cat_id);
$post_cat_id=$post_cat_id['0'] ["term_id"];
$display_voting = get_tax_meta($post_cat_id,'cwp_display_voting');
if(!wp_is_post_revision($post_id))
    update_post_meta($post_id,'display_voting', $display_voting);
}
add_action( 'save_post', 'cwp_add_custom_post_meta', 10, 2 );