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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 |
|---|---|
| 13 | * @param int $max_side Maximum length of a single side for the thumbnail |
| 14 | * @return string Thumbnail path on success, Error string on failure |
| 15 | * |
| 16 | * This function can handle most image file formats which PHP supports. |
| 17 | * If PHP does not have the functionality to save in a file of the same format, the thumbnail will be created as a jpeg. |
| 18 | */ |
| 19 | function wp_create_thumbnail( $file, $max_side, $deprecated = '' ) { |
| 20 | |
| 21 | $thumbpath = image_resize( $file, $max_side, $max_side ); |
| 22 | return apply_filters( 'wp_create_thumbnail', $thumbpath ); |
| 23 | } |
| 24 | |
| 25 | /** |
| 26 | * wp_crop_image() - Crop an Image to a given size. |
| 27 | * |
| 28 | * @package WordPress |
| 29 | * @internal Missing Long Description |
| 30 | * @param int $src_file The source file |
| 31 | * @param int $src_x The start x position to crop from |