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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 |
|---|---|
| 233 | * @param string $filename |
| 234 | * @param WP_Image_Editor $image |
| 235 | * @param string $mime_type |
| 236 | * @param int $post_id |
| 237 | * @return boolean |
| 238 | */ |
| 239 | function wp_save_image_file( $filename, $image, $mime_type, $post_id ) { |
| 240 | if ( $image instanceof WP_Image_Editor ) { |
| 241 | $image = apply_filters('image_editor_save_pre', $image, $post_id); |
| 242 | $saved = apply_filters('wp_save_image_editor_file', null, $filename, $image, $mime_type, $post_id); |
| 243 | |
| 244 | if ( null !== $saved ) |
| 245 | return $saved; |
| 246 | |
| 247 | return $image->save( $filename, $mime_type ); |
| 248 | } else { |
| 249 | _deprecated_argument( __FUNCTION__, '3.5', __( '$image needs to be an WP_Image_Editor object' ) ); |
| 250 | |
| 251 | $image = apply_filters('image_save_pre', $image, $post_id); |