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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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244 |
|
245 | /** |
246 | * Filter the WP_Image_Editor instance for the image to be streamed to the browser. |
247 | * |
248 | * @since 3.5.0 |
249 | * |
250 | * @param WP_Image_Editor $image WP_Image_Editor instance. |
251 | * @param int $post_id Post ID. |
252 | */ |
253 | $image = apply_filters( 'image_editor_save_pre', $image, $post_id ); |
254 |
|
255 | if ( is_wp_error( $image->stream( $mime_type ) ) ) |
256 | return false; |
257 |
|
258 | return true; |
259 | } else { |
260 | _deprecated_argument( __FUNCTION__, '3.5', __( '$image needs to be an WP_Image_Editor object' ) ); |
261 |
|
262 | /** |
Line | Code |
293 | * @param WP_Image_Editor $image |
294 | * @param string $mime_type |
295 | * @param int $post_id |
296 | * @return bool |
297 | */ |
298 | function wp_save_image_file( $filename, $image, $mime_type, $post_id ) { |
299 | if ( $image instanceof WP_Image_Editor ) { |
300 |
|
301 | /** This filter is documented in wp-admin/includes/image-edit.php */ |
302 | $image = apply_filters( 'image_editor_save_pre', $image, $post_id ); |
303 |
|
304 | /** |
305 | * Filter whether to skip saving the image file. |
306 | * |
307 | * Returning a non-null value will short-circuit the save method, |
308 | * returning that value instead. |
309 | * |
310 | * @since 3.5.0 |
311 | * |