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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 2 times in this file.
Line | Code |
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242 |
|
243 | /** |
244 | * Filters the WP_Image_Editor instance for the image to be streamed to the browser. |
245 | * |
246 | * @since 3.5.0 |
247 | * |
248 | * @param WP_Image_Editor $image The image editor instance. |
249 | * @param int $attachment_id The attachment post ID. |
250 | */ |
251 | $image = apply_filters( 'image_editor_save_pre', $image, $attachment_id ); |
252 |
|
253 | if ( is_wp_error( $image->stream( $mime_type ) ) ) |
254 | return false; |
255 |
|
256 | return true; |
257 | } else { |
258 | _deprecated_argument( __FUNCTION__, '3.5.0', __( '$image needs to be an WP_Image_Editor object' ) ); |
259 |
|
260 | /** |
Line | Code |
291 | * @param WP_Image_Editor $image |
292 | * @param string $mime_type |
293 | * @param int $post_id |
294 | * @return bool |
295 | */ |
296 | function wp_save_image_file( $filename, $image, $mime_type, $post_id ) { |
297 | if ( $image instanceof WP_Image_Editor ) { |
298 |
|
299 | /** This filter is documented in wp-admin/includes/image-edit.php */ |
300 | $image = apply_filters( 'image_editor_save_pre', $image, $post_id ); |
301 |
|
302 | /** |
303 | * Filters whether to skip saving the image file. |
304 | * |
305 | * Returning a non-null value will short-circuit the save method, |
306 | * returning that value instead. |
307 | * |
308 | * @since 3.5.0 |
309 | * |