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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 |
|---|---|
| 567 | public function column_default( $blog, $column_name ) { |
| 568 | /** |
| 569 | * Fires for each registered custom column in the Sites list table. |
| 570 | * |
| 571 | * @since 3.1.0 |
| 572 | * |
| 573 | * @param string $column_name The name of the column to display. |
| 574 | * @param int $blog_id The site ID. |
| 575 | */ |
| 576 | do_action( 'manage_sites_custom_column', $column_name, $blog['blog_id'] ); |
| 577 | } |
| 578 | |
| 579 | /** |
| 580 | * @global string $mode List table view mode. |
| 581 | */ |
| 582 | public function display_rows() { |
| 583 | foreach ( $this->items as $blog ) { |
| 584 | $blog = $blog->to_array(); |
| 585 | $class = ''; |