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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 |
|---|---|
| 399 | public function column_default( $blog, $column_name ) { |
| 400 | /** |
| 401 | * Fires for each registered custom column in the Sites list table. |
| 402 | * |
| 403 | * @since 3.1.0 |
| 404 | * |
| 405 | * @param string $column_name The name of the column to display. |
| 406 | * @param int $blog_id The site ID. |
| 407 | */ |
| 408 | do_action( 'manage_sites_custom_column', $column_name, $blog['blog_id'] ); |
| 409 | } |
| 410 | |
| 411 | /** |
| 412 | * |
| 413 | * @global string $mode |
| 414 | */ |
| 415 | public function display_rows() { |
| 416 | foreach ( $this->items as $blog ) { |
| 417 | $class = ''; |