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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 |
|---|---|
| 214 | // Backwards compatibility with old load-page-new.php, load-page.php, |
| 215 | // and load-categories.php actions. |
| 216 | if ( $typenow == 'page' ) { |
| 217 | if ( $pagenow == 'post-new.php' ) |
| 218 | do_action( 'load-page-new.php' ); |
| 219 | elseif ( $pagenow == 'post.php' ) |
| 220 | do_action( 'load-page.php' ); |
| 221 | } elseif ( $pagenow == 'edit-tags.php' ) { |
| 222 | if ( $taxnow == 'category' ) |
| 223 | do_action( 'load-categories.php' ); |
| 224 | elseif ( $taxnow == 'link_category' ) |
| 225 | do_action( 'load-edit-link-categories.php' ); |
| 226 | } |
| 227 | } |
| 228 | |
| 229 | if ( !empty($_REQUEST['action']) ) |
| 230 | do_action('admin_action_' . $_REQUEST['action']); |
| 231 | |