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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 |
|---|---|
| 209 | |
| 210 | /** |
| 211 | * Filter the WP_Image_Editor instance for the image to be streamed to the browser. |
| 212 | * |
| 213 | * @since 3.5.0 |
| 214 | * |
| 215 | * @param WP_Image_Editor $image WP_Image_Editor instance. |
| 216 | * @param int $post_id Post ID. |
| 217 | */ |
| 218 | $image = apply_filters( 'image_editor_save_pre', $image, $post_id ); |
| 219 | |
| 220 | if ( is_wp_error( $image->stream( $mime_type ) ) ) |
| 221 | return false; |
| 222 | |
| 223 | return true; |
| 224 | } else { |
| 225 | _deprecated_argument( __FUNCTION__, '3.5', __( '$image needs to be an WP_Image_Editor object' ) ); |
| 226 | |
| 227 | /** |
| Line | Code |
| 258 | * @param WP_Image_Editor $image |
| 259 | * @param string $mime_type |
| 260 | * @param int $post_id |
| 261 | * @return boolean |
| 262 | */ |
| 263 | function wp_save_image_file( $filename, $image, $mime_type, $post_id ) { |
| 264 | if ( $image instanceof WP_Image_Editor ) { |
| 265 | |
| 266 | /** This filter is documented in wp-admin/includes/image-edit.php */ |
| 267 | $image = apply_filters( 'image_editor_save_pre', $image, $post_id ); |
| 268 | |
| 269 | /** |
| 270 | * Filter whether to skip saving the image file. |
| 271 | * |
| 272 | * Returning a non-null value will short-circuit the save method, |
| 273 | * returning that value instead. |
| 274 | * |
| 275 | * @since 3.5.0 |
| 276 | * |