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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 |
|---|---|
| 652 | * Filter the list table sortable columns for a specific screen. |
| 653 | * |
| 654 | * The dynamic portion of the hook name, $this->screen->id, refers |
| 655 | * to the ID of the current screen, usually a string. |
| 656 | * |
| 657 | * @since 3.5.0 |
| 658 | * |
| 659 | * @param array $sortable_columns An array of sortable columns. |
| 660 | */ |
| 661 | $_sortable = apply_filters( "manage_{$this->screen->id}_sortable_columns", $sortable_columns ); |
| 662 | |
| 663 | $sortable = array(); |
| 664 | foreach ( $_sortable as $id => $data ) { |
| 665 | if ( empty( $data ) ) |
| 666 | continue; |
| 667 | |
| 668 | $data = (array) $data; |
| 669 | if ( !isset( $data[1] ) ) |
| 670 | $data[1] = false; |