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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 |
|---|---|
| 579 | function get_column_info() { |
| 580 | if ( isset( $this->_column_headers ) ) |
| 581 | return $this->_column_headers; |
| 582 | |
| 583 | $screen = get_current_screen(); |
| 584 | |
| 585 | $columns = get_column_headers( $screen ); |
| 586 | $hidden = get_hidden_columns( $screen ); |
| 587 | |
| 588 | $_sortable = apply_filters( "manage_{$screen->id}_sortable_columns", $this->get_sortable_columns() ); |
| 589 | |
| 590 | $sortable = array(); |
| 591 | foreach ( $_sortable as $id => $data ) { |
| 592 | if ( empty( $data ) ) |
| 593 | continue; |
| 594 | |
| 595 | $data = (array) $data; |
| 596 | if ( !isset( $data[1] ) ) |
| 597 | $data[1] = false; |