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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 |
---|---|
626 | * Fires for each custom column in the Media list table. |
627 | * |
628 | * Custom columns are registered using the {@see 'manage_media_columns'} filter. |
629 | * |
630 | * @since 2.5.0 |
631 | * |
632 | * @param string $column_name Name of the custom column. |
633 | * @param int $post_id Attachment ID. |
634 | */ |
635 | do_action( 'manage_media_custom_column', $column_name, $post->ID ); |
636 | } |
637 |
|
638 | /** |
639 | * @global WP_Post $post Global post object. |
640 | */ |
641 | public function display_rows() { |
642 | global $post, $wp_query; |
643 |
|
644 | $post_ids = wp_list_pluck( $wp_query->posts, 'ID' ); |