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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 |
|---|---|
| 533 | * Fires for each custom column in the Media list table. |
| 534 | * |
| 535 | * Custom columns are registered using the {@see 'manage_media_columns'} filter. |
| 536 | * |
| 537 | * @since 2.5.0 |
| 538 | * |
| 539 | * @param string $column_name Name of the custom column. |
| 540 | * @param int $post_id Attachment ID. |
| 541 | */ |
| 542 | do_action( 'manage_media_custom_column', $column_name, $post->ID ); |
| 543 | } |
| 544 | |
| 545 | /** |
| 546 | * |
| 547 | * @global WP_Post $post |
| 548 | */ |
| 549 | public function display_rows() { |
| 550 | global $post; |
| 551 | |