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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 |
|---|---|
| 349 | $id = wp_insert_attachment($object, $file); |
| 350 | |
| 351 | list($width, $height, $type, $attr) = getimagesize( $file ); |
| 352 | |
| 353 | if ( $width == HEADER_IMAGE_WIDTH && $height == HEADER_IMAGE_HEIGHT ) { |
| 354 | // Add the meta-data |
| 355 | wp_update_attachment_metadata( $id, wp_generate_attachment_metadata( $id, $file ) ); |
| 356 | |
| 357 | set_theme_mod('header_image', esc_url($url)); |
| 358 | do_action('wp_create_file_in_uploads', $file, $id); // For replication |
| 359 | return $this->finished(); |
| 360 | } elseif ( $width > HEADER_IMAGE_WIDTH ) { |
| 361 | $oitar = $width / HEADER_IMAGE_WIDTH; |
| 362 | $image = wp_crop_image($file, 0, 0, $width, $height, HEADER_IMAGE_WIDTH, $height / $oitar, false, str_replace(basename($file), 'midsize-'.basename($file), $file)); |
| 363 | $image = apply_filters('wp_create_file_in_uploads', $image, $id); // For replication |
| 364 | |
| 365 | $url = str_replace(basename($url), basename($image), $url); |
| 366 | $width = $width / $oitar; |
| 367 | $height = $height / $oitar; |
| 368 | } else { |
| 369 | $oitar = 1; |
| 370 | } |
| 371 | ?> |
| 372 | |
| Line | Code |
| 408 | $_POST['x1'] = $_POST['x1'] * $_POST['oitar']; |
| 409 | $_POST['y1'] = $_POST['y1'] * $_POST['oitar']; |
| 410 | $_POST['width'] = $_POST['width'] * $_POST['oitar']; |
| 411 | $_POST['height'] = $_POST['height'] * $_POST['oitar']; |
| 412 | } |
| 413 | |
| 414 | $original = get_attached_file( $_POST['attachment_id'] ); |
| 415 | |
| 416 | $cropped = wp_crop_image($_POST['attachment_id'], $_POST['x1'], $_POST['y1'], $_POST['width'], $_POST['height'], HEADER_IMAGE_WIDTH, HEADER_IMAGE_HEIGHT); |
| 417 | $cropped = apply_filters('wp_create_file_in_uploads', $cropped, $_POST['attachment_id']); // For replication |
| 418 | |
| 419 | $parent = get_post($_POST['attachment_id']); |
| 420 | $parent_url = $parent->guid; |
| 421 | $url = str_replace(basename($parent_url), basename($cropped), $parent_url); |
| 422 | |
| 423 | // Construct the object array |
| 424 | $object = array( |
| 425 | 'ID' => $_POST['attachment_id'], |
| 426 | 'post_title' => basename($cropped), |