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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 |
|---|---|
| 15 | * @return array Containing the headers in the format id => UI String |
| 16 | */ |
| 17 | function get_column_headers( $screen ) { |
| 18 | if ( is_string( $screen ) ) |
| 19 | $screen = convert_to_screen( $screen ); |
| 20 | |
| 21 | static $column_headers = array(); |
| 22 | |
| 23 | if ( ! isset( $column_headers[ $screen->id ] ) ) |
| 24 | $column_headers[ $screen->id ] = apply_filters( 'manage_' . $screen->id . '_columns', array() ); |
| 25 | |
| 26 | return $column_headers[ $screen->id ]; |
| 27 | } |
| 28 | |
| 29 | /** |
| 30 | * Get a list of hidden columns. |
| 31 | * |
| 32 | * @since 2.7.0 |
| 33 | * |