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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 | 
|---|---|
| 1 | <?php | 
| 2 |  | 
| 3 | function get_users_drafts( $user_id ) { | 
| 4 |      global $wpdb; | 
| 5 |      $user_id = (int) $user_id; | 
| 6 |      $query = "SELECT ID, post_title FROM $wpdb->posts WHERE post_status = 'draft' AND post_author = $user_id ORDER BY ID DESC"; | 
| 7 |      $query = apply_filters('get_users_drafts', $query); | 
| 8 |      return $wpdb->get_results( $query ); | 
| 9 | } | 
| 10 |  | 
| 11 | function get_others_drafts( $user_id ) { | 
| 12 |      global $wpdb; | 
| 13 |      $user = get_userdata( $user_id ); | 
| 14 |      $level_key = $wpdb->prefix . 'user_level'; | 
| 15 |  | 
| 16 |      $editable = get_editable_user_ids( $user_id ); |