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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 |
|---|---|
| 230 | * @return array Containing the headers in the format id => UI String |
| 231 | */ |
| 232 | function get_column_headers( $screen ) { |
| 233 | if ( is_string( $screen ) ) |
| 234 | $screen = convert_to_screen( $screen ); |
| 235 | |
| 236 | global $_wp_column_headers; |
| 237 | |
| 238 | if ( !isset( $_wp_column_headers[ $screen->id ] ) ) { |
| 239 | $_wp_column_headers[ $screen->id ] = apply_filters( 'manage_' . $screen->id . '_columns', array() ); |
| 240 | } |
| 241 | |
| 242 | return $_wp_column_headers[ $screen->id ]; |
| 243 | } |
| 244 | |
| 245 | /** |
| 246 | * Get a list of hidden columns. |
| 247 | * |
| 248 | * @since 2.7.0 |