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/**

 * WordPress发布文章/页面时自动添加默认的自定义字段

 * https://www.wpdaxue.com/add-custom-field-automatically-post-page-publish.html

 */

add_action('publish_page', 'add_custom_field_automatically');//发布页面时

add_action('publish_post', 'add_custom_field_automatically');//发布文章时

function add_custom_field_automatically($post_ID) {

	global $wpdb;

	if(!wp_is_post_revision($post_ID)) {

		add_post_meta($post_ID, '字段名', '字段值', true);

	}

}