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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 |
|---|---|
| 1285 | * Filters the list table sortable columns for a specific screen. |
| 1286 | * |
| 1287 | * The dynamic portion of the hook name, `$this->screen->id`, refers |
| 1288 | * to the ID of the current screen. |
| 1289 | * |
| 1290 | * @since 3.1.0 |
| 1291 | * |
| 1292 | * @param array $sortable_columns An array of sortable columns. |
| 1293 | */ |
| 1294 | $_sortable = apply_filters( "manage_{$this->screen->id}_sortable_columns", $sortable_columns ); |
| 1295 | |
| 1296 | $sortable = array(); |
| 1297 | foreach ( $_sortable as $id => $data ) { |
| 1298 | if ( empty( $data ) ) { |
| 1299 | continue; |
| 1300 | } |
| 1301 | |
| 1302 | $data = (array) $data; |
| 1303 | // Descending initial sorting. |