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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 |
---|---|
208 |
|
209 | /** |
210 | * Filter the WP_Image_Editor instance for the image to be streamed to the browser. |
211 | * |
212 | * @since 3.5.0 |
213 | * |
214 | * @param WP_Image_Editor $image WP_Image_Editor instance. |
215 | * @param int $post_id Post ID. |
216 | */ |
217 | $image = apply_filters( 'image_editor_save_pre', $image, $post_id ); |
218 |
|
219 | if ( is_wp_error( $image->stream( $mime_type ) ) ) |
220 | return false; |
221 |
|
222 | return true; |
223 | } else { |
224 | _deprecated_argument( __FUNCTION__, '3.5', __( '$image needs to be an WP_Image_Editor object' ) ); |
225 |
|
226 | /** |
Line | Code |
257 | * @param WP_Image_Editor $image |
258 | * @param string $mime_type |
259 | * @param int $post_id |
260 | * @return boolean |
261 | */ |
262 | function wp_save_image_file( $filename, $image, $mime_type, $post_id ) { |
263 | if ( $image instanceof WP_Image_Editor ) { |
264 |
|
265 | /** This filter is documented in wp-admin/includes/image-edit.php */ |
266 | $image = apply_filters( 'image_editor_save_pre', $image, $post_id ); |
267 |
|
268 | /** |
269 | * Filter whether to skip saving the image file. |
270 | * |
271 | * Returning a non-null value will short-circuit the save method, |
272 | * returning that value instead. |
273 | * |
274 | * @since 3.5.0 |
275 | * |