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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 |
|---|---|
| 235 | |
| 236 | /** |
| 237 | * Filters the displayed site columns in Sites list table. |
| 238 | * |
| 239 | * @since MU (3.0.0) |
| 240 | * |
| 241 | * @param array $sites_columns An array of displayed site columns. Default 'cb', |
| 242 | * 'blogname', 'lastupdated', 'registered', 'users'. |
| 243 | */ |
| 244 | return apply_filters( 'wpmu_blogs_columns', $sites_columns ); |
| 245 | } |
| 246 | |
| 247 | /** |
| 248 | * @return array |
| 249 | */ |
| 250 | protected function get_sortable_columns() { |
| 251 | return array( |
| 252 | 'blogname' => 'blogname', |
| 253 | 'lastupdated' => 'lastupdated', |