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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 4567 | * @uses do_action() Calls 'xmlprc_publish_post' on post ID if XMLRPC_REQUEST is defined. |
| 4568 | * @uses do_action() Calls 'app_publish_post' on post ID if APP_REQUEST is defined. |
| 4569 | * |
| 4570 | * @param int $post_id The ID in the database table of the post being published |
| 4571 | */ |
| 4572 | function _publish_post_hook($post_id) { |
| 4573 | global $wpdb; |
| 4574 | |
| 4575 | if ( defined('XMLRPC_REQUEST') ) |
| 4576 | do_action('xmlrpc_publish_post', $post_id); |
| 4577 | if ( defined('APP_REQUEST') ) |
| 4578 | do_action('app_publish_post', $post_id); |
| 4579 | |
| 4580 | if ( defined('WP_IMPORTING') ) |
| 4581 | return; |
| 4582 | |
| 4583 | $data = array( 'post_id' => $post_id, 'meta_value' => '1' ); |
| 4584 | if ( get_option('default_pingback_flag') ) { |
| 4585 | $wpdb->insert( $wpdb->postmeta, $data + array( 'meta_key' => '_pingme' ) ); |