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