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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 |
|---|---|
| 646 | * Fires for each custom column in the Media list table. |
| 647 | * |
| 648 | * Custom columns are registered using the {@see 'manage_media_columns'} filter. |
| 649 | * |
| 650 | * @since 2.5.0 |
| 651 | * |
| 652 | * @param string $column_name Name of the custom column. |
| 653 | * @param int $post_id Attachment ID. |
| 654 | */ |
| 655 | do_action( 'manage_media_custom_column', $column_name, $post->ID ); |
| 656 | } |
| 657 | |
| 658 | /** |
| 659 | * @global WP_Post $post Global post object. |
| 660 | */ |
| 661 | public function display_rows() { |
| 662 | global $post, $wp_query; |
| 663 | |
| 664 | $post_ids = wp_list_pluck( $wp_query->posts, 'ID' ); |