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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.
This hook occurs 3 times in this file.
| Line | Code |
|---|---|
| 226 | $id = wp_insert_attachment($object, $file); |
| 227 | |
| 228 | list($width, $height, $type, $attr) = getimagesize( $file ); |
| 229 | |
| 230 | if ( $width == HEADER_IMAGE_WIDTH && $height == HEADER_IMAGE_HEIGHT ) { |
| 231 | // Add the meta-data |
| 232 | wp_update_attachment_metadata( $id, wp_generate_attachment_metadata( $id, $file ) ); |
| 233 | |
| 234 | set_theme_mod('header_image', clean_url($url)); |
| 235 | do_action('wp_create_file_in_uploads', $file, $id); // For replication |
| 236 | return $this->finished(); |
| 237 | } elseif ( $width > HEADER_IMAGE_WIDTH ) { |
| 238 | $oitar = $width / HEADER_IMAGE_WIDTH; |
| 239 | $image = wp_crop_image($file, 0, 0, $width, $height, HEADER_IMAGE_WIDTH, $height / $oitar, false, str_replace(basename($file), 'midsize-'.basename($file), $file)); |
| 240 | $image = apply_filters('wp_create_file_in_uploads', $image, $id); // For replication |
| 241 | |
| 242 | $url = str_replace(basename($url), basename($image), $url); |
| 243 | $width = $width / $oitar; |
| 244 | $height = $height / $oitar; |
| 245 | } else { |
| 246 | $oitar = 1; |
| 247 | } |
| 248 | ?> |
| 249 | |
| Line | Code |
| 280 | $_POST['x1'] = $_POST['x1'] * $_POST['oitar']; |
| 281 | $_POST['y1'] = $_POST['y1'] * $_POST['oitar']; |
| 282 | $_POST['width'] = $_POST['width'] * $_POST['oitar']; |
| 283 | $_POST['height'] = $_POST['height'] * $_POST['oitar']; |
| 284 | } |
| 285 | |
| 286 | $original = get_attached_file( $_POST['attachment_id'] ); |
| 287 | |
| 288 | $cropped = wp_crop_image($_POST['attachment_id'], $_POST['x1'], $_POST['y1'], $_POST['width'], $_POST['height'], HEADER_IMAGE_WIDTH, HEADER_IMAGE_HEIGHT); |
| 289 | $cropped = apply_filters('wp_create_file_in_uploads', $cropped, $_POST['attachment_id']); // For replication |
| 290 | |
| 291 | $parent = get_post($_POST['attachment_id']); |
| 292 | $parent_url = $parent->guid; |
| 293 | $url = str_replace(basename($parent_url), basename($cropped), $parent_url); |
| 294 | |
| 295 | // Construct the object array |
| 296 | $object = array( |
| 297 | 'ID' => $_POST['attachment_id'], |
| 298 | 'post_title' => basename($cropped), |