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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 |
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280 |
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281 | /** |
282 | * Filters the taxonomy columns for attachments in the Media list table. |
283 | * |
284 | * @since 3.5.0 |
285 | * |
286 | * @param array $taxonomies An array of registered taxonomies to show for attachments. |
287 | * @param string $post_type The post type. Default 'attachment'. |
288 | */ |
289 | $taxonomies = apply_filters( 'manage_taxonomies_for_attachment_columns', $taxonomies, 'attachment' ); |
290 | $taxonomies = array_filter( $taxonomies, 'taxonomy_exists' ); |
291 |
|
292 | foreach ( $taxonomies as $taxonomy ) { |
293 | if ( 'category' === $taxonomy ) { |
294 | $column_key = 'categories'; |
295 | } elseif ( 'post_tag' === $taxonomy ) { |
296 | $column_key = 'tags'; |
297 | } else { |
298 | $column_key = 'taxonomy-' . $taxonomy; |