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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 |
---|---|
132 | /* translators: column name */ |
133 | $posts_columns['title'] = _x( 'File', 'column name' ); |
134 | $posts_columns['author'] = __( 'Author' ); |
135 |
|
136 | $taxonomies = array(); |
137 |
|
138 | $taxonomies = get_taxonomies_for_attachments( 'objects' ); |
139 | $taxonomies = wp_filter_object_list( $taxonomies, array( 'show_admin_column' => true ), 'and', 'name' ); |
140 |
|
141 | $taxonomies = apply_filters( 'manage_taxonomies_for_attachment_columns', $taxonomies, 'attachment' ); |
142 | $taxonomies = array_filter( $taxonomies, 'taxonomy_exists' ); |
143 |
|
144 | foreach ( $taxonomies as $taxonomy ) { |
145 | if ( 'category' == $taxonomy ) |
146 | $column_key = 'categories'; |
147 | elseif ( 'post_tag' == $taxonomy ) |
148 | $column_key = 'tags'; |
149 | else |
150 | $column_key = 'taxonomy-' . $taxonomy; |