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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 |
|---|---|
| 289 | $parent_url = $parent->guid; |
| 290 | |
| 291 | $url = str_replace(basename($parent_url), basename($header), $parent_url); |
| 292 | |
| 293 | set_theme_mod('header_image', $url); |
| 294 | |
| 295 | // cleanup |
| 296 | $file = get_attached_file( $_POST['attachment_id'] ); |
| 297 | $medium = str_replace(basename($file), 'midsize-'.basename($file), $file); |
| 298 | @unlink( apply_filters( 'wp_delete_file', $medium ) ); |
| 299 | wp_delete_attachment( $_POST['attachment_id'] ); |
| 300 | |
| 301 | return $this->finished(); |
| 302 | } |
| 303 | |
| 304 | function finished() { |
| 305 | ?> |
| 306 | <div class="wrap"> |
| 307 | <h2><?php _e('Header complete!'); ?></h2> |