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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 | 
|---|---|
| 997 |                      * The filter is evaluated for all image sizes except 'full'. | 
| 998 |                      * | 
| 999 |                      * @since 3.1.0 | 
| 1000 |                      * | 
| 1001 |                      * @param string       $path          Path to the current image. | 
| 1002 |                      * @param int          $attachment_id Attachment ID. | 
| 1003 |                      * @param string|int[] $size          Requested image size. Can be any registered image size name, or | 
| 1004 |                      *                                    an array of width and height values in pixels (in that order). | 
| 1005 |                      */ | 
| 1006 |                     $filepath = apply_filters( 'load_image_to_edit_filesystempath', $filepath, $attachment_id, $size ); | 
| 1007 |                } | 
| 1008 |           } | 
| 1009 |      } elseif ( function_exists( 'fopen' ) && ini_get( 'allow_url_fopen' ) ) { | 
| 1010 |           /** | 
| 1011 |            * Filters the path to an attachment's URL when editing the image. | 
| 1012 |            * | 
| 1013 |            * The filter is only evaluated if the file isn't stored locally and `allow_url_fopen` is enabled on the server. | 
| 1014 |            * | 
| 1015 |            * @since 3.1.0 |