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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 |
---|---|
593 | function get_column_info() { |
594 | if ( isset( $this->_column_headers ) ) |
595 | return $this->_column_headers; |
596 |
|
597 | $screen = get_current_screen(); |
598 |
|
599 | $columns = get_column_headers( $screen ); |
600 | $hidden = get_hidden_columns( $screen ); |
601 |
|
602 | $_sortable = apply_filters( "manage_{$screen->id}_sortable_columns", $this->get_sortable_columns() ); |
603 |
|
604 | $sortable = array(); |
605 | foreach ( $_sortable as $id => $data ) { |
606 | if ( empty( $data ) ) |
607 | continue; |
608 |
|
609 | $data = (array) $data; |
610 | if ( !isset( $data[1] ) ) |
611 | $data[1] = false; |