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