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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 |
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224 | // Save the data |
225 | $id = wp_insert_attachment($object, $file); |
226 |
|
227 | $upload = array('file' => $file, 'id' => $id); |
228 |
|
229 | list($width, $height, $type, $attr) = getimagesize( $file ); |
230 |
|
231 | if ( $width == HEADER_IMAGE_WIDTH && $height == HEADER_IMAGE_HEIGHT ) { |
232 | set_theme_mod('header_image', clean_url($url)); |
233 | $header = apply_filters('wp_create_file_in_uploads', $file, $id); // For replication |
234 | return $this->finished(); |
235 | } elseif ( $width > HEADER_IMAGE_WIDTH ) { |
236 | $oitar = $width / HEADER_IMAGE_WIDTH; |
237 | $image = wp_crop_image($file, 0, 0, $width, $height, HEADER_IMAGE_WIDTH, $height / $oitar, false, str_replace(basename($file), 'midsize-'.basename($file), $file)); |
238 | $image = apply_filters('wp_create_file_in_uploads', $image, $id); // For replication |
239 |
|
240 | $url = str_replace(basename($url), basename($image), $url); |
241 | $width = $width / $oitar; |
242 | $height = $height / $oitar; |
243 | } else { |
244 | $oitar = 1; |
245 | } |
246 | ?> |
247 |
|
Line | Code |
276 | check_admin_referer('custom-header'); |
277 | if ( $_POST['oitar'] > 1 ) { |
278 | $_POST['x1'] = $_POST['x1'] * $_POST['oitar']; |
279 | $_POST['y1'] = $_POST['y1'] * $_POST['oitar']; |
280 | $_POST['width'] = $_POST['width'] * $_POST['oitar']; |
281 | $_POST['height'] = $_POST['height'] * $_POST['oitar']; |
282 | } |
283 |
|
284 | $header = wp_crop_image($_POST['attachment_id'], $_POST['x1'], $_POST['y1'], $_POST['width'], $_POST['height'], HEADER_IMAGE_WIDTH, HEADER_IMAGE_HEIGHT); |
285 | $header = apply_filters('wp_create_file_in_uploads', $header); // For replication |
286 |
|
287 | $parent = get_post($_POST['attachment_id']); |
288 |
|
289 | $parent_url = $parent->guid; |
290 |
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291 | $url = str_replace(basename($parent_url), basename($header), $parent_url); |
292 |
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293 | set_theme_mod('header_image', $url); |
294 |
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