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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 |
|---|---|
| 134 | //$posts_columns['tags'] = _x( 'Tags', 'column name' ); |
| 135 | /* translators: column name */ |
| 136 | if ( !$this->detached ) { |
| 137 | $posts_columns['parent'] = _x( 'Attached to', 'column name' ); |
| 138 | if ( post_type_supports( 'attachment', 'comments' ) ) |
| 139 | $posts_columns['comments'] = '<span class="vers"><img alt="' . esc_attr__( 'Comments' ) . '" src="' . esc_url( admin_url( 'images/comment-grey-bubble.png' ) ) . '" /></span>'; |
| 140 | } |
| 141 | /* translators: column name */ |
| 142 | $posts_columns['date'] = _x( 'Date', 'column name' ); |
| 143 | $posts_columns = apply_filters( 'manage_media_columns', $posts_columns, $this->detached ); |
| 144 | |
| 145 | return $posts_columns; |
| 146 | } |
| 147 | |
| 148 | function get_sortable_columns() { |
| 149 | return array( |
| 150 | 'title' => 'title', |
| 151 | 'author' => 'author', |
| 152 | 'parent' => 'parent', |