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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 |
|---|---|
| 173 | ); |
| 174 | /** |
| 175 | * Filters the columns displayed in the Network Admin Users list table. |
| 176 | * |
| 177 | * @since MU (3.0.0) |
| 178 | * |
| 179 | * @param array $users_columns An array of user columns. Default 'cb', 'username', |
| 180 | * 'name', 'email', 'registered', 'blogs'. |
| 181 | */ |
| 182 | return apply_filters( 'wpmu_users_columns', $users_columns ); |
| 183 | } |
| 184 | |
| 185 | /** |
| 186 | * |
| 187 | * @return array |
| 188 | */ |
| 189 | protected function get_sortable_columns() { |
| 190 | return array( |
| 191 | 'username' => 'login', |