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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 |
|---|---|
| 737 | $image_ratio = $image_height / $image_new_height; |
| 738 | $image_new_width = $image_width / $image_ratio; |
| 739 | //height > width |
| 740 | } |
| 741 | |
| 742 | $thumbnail = imagecreatetruecolor($image_new_width, $image_new_height); |
| 743 | @ imagecopyresampled($thumbnail, $image, 0, 0, 0, 0, $image_new_width, $image_new_height, $image_attr[0], $image_attr[1]); |
| 744 | |
| 745 | // If no filters change the filename, we'll do a default transformation. |
| 746 | if ( basename($file) == $thumb = apply_filters('thumbnail_filename', basename($file)) ) |
| 747 | $thumb = preg_replace('!(\.[^.]+)?$!', __('.thumbnail').'$1', basename($file), 1); |
| 748 | |
| 749 | $thumbpath = str_replace(basename($file), $thumb, $file); |
| 750 | |
| 751 | // move the thumbnail to it's final destination |
| 752 | if ($type[2] == 1) { |
| 753 | if (!imagegif($thumbnail, $thumbpath)) { |
| 754 | $error = __("Thumbnail path invalid"); |
| 755 | } |