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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 |
|---|---|
| 297 | |
| 298 | /** |
| 299 | * Filters the WP_Image_Editor instance for the image to be streamed to the browser. |
| 300 | * |
| 301 | * @since 3.5.0 |
| 302 | * |
| 303 | * @param WP_Image_Editor $image The image editor instance. |
| 304 | * @param int $attachment_id The attachment post ID. |
| 305 | */ |
| 306 | $image = apply_filters( 'image_editor_save_pre', $image, $attachment_id ); |
| 307 | |
| 308 | if ( is_wp_error( $image->stream( $mime_type ) ) ) { |
| 309 | return false; |
| 310 | } |
| 311 | |
| 312 | return true; |
| 313 | } else { |
| 314 | /* translators: 1: $image, 2: WP_Image_Editor */ |
| 315 | _deprecated_argument( __FUNCTION__, '3.5.0', sprintf( __( '%1$s needs to be a %2$s object.' ), '$image', 'WP_Image_Editor' ) ); |
| Line | Code |
| 356 | * @param WP_Image_Editor $image The image editor instance. |
| 357 | * @param string $mime_type The mime type of the image. |
| 358 | * @param int $post_id Attachment post ID. |
| 359 | * @return bool True on success, false on failure. |
| 360 | */ |
| 361 | function wp_save_image_file( $filename, $image, $mime_type, $post_id ) { |
| 362 | if ( $image instanceof WP_Image_Editor ) { |
| 363 | |
| 364 | /** This filter is documented in wp-admin/includes/image-edit.php */ |
| 365 | $image = apply_filters( 'image_editor_save_pre', $image, $post_id ); |
| 366 | |
| 367 | /** |
| 368 | * Filters whether to skip saving the image file. |
| 369 | * |
| 370 | * Returning a non-null value will short-circuit the save method, |
| 371 | * returning that value instead. |
| 372 | * |
| 373 | * @since 3.5.0 |
| 374 | * |