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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 |
|---|---|
| 326 | |
| 327 | // convert it to table rows |
| 328 | $out = ''; |
| 329 | $class = ''; |
| 330 | $count = 0; |
| 331 | foreach( $tags as $tag ) |
| 332 | $out .= _tag_row( $tag, ++$count % 2 ? ' class="alternate"' : '' ); |
| 333 | |
| 334 | // filter and send to screen |
| 335 | $out = apply_filters('tag_rows', $out); |
| 336 | echo $out; |
| 337 | return $count; |
| 338 | } |
| 339 | |
| 340 | // define the columns to display, the syntax is 'internal name' => 'display name' |
| 341 | function wp_manage_posts_columns() { |
| 342 | $posts_columns = array(); |
| 343 | $posts_columns['cb'] = '<input type="checkbox" />'; |
| 344 | if ( 'draft' === $_GET['post_status'] ) |