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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 |
|---|---|
| 226 | /** |
| 227 | * Filter the GD image resource to be streamed to the browser. |
| 228 | * |
| 229 | * @since 2.9.0 |
| 230 | * @deprecated 3.5.0 Use image_editor_save_pre instead. |
| 231 | * |
| 232 | * @param resource $image Image resource to be streamed. |
| 233 | * @param int $post_id Post ID. |
| 234 | */ |
| 235 | $image = apply_filters( 'image_save_pre', $image, $post_id ); |
| 236 | |
| 237 | switch ( $mime_type ) { |
| 238 | case 'image/jpeg': |
| 239 | header( 'Content-Type: image/jpeg' ); |
| 240 | return imagejpeg( $image, null, 90 ); |
| 241 | case 'image/png': |
| 242 | header( 'Content-Type: image/png' ); |
| 243 | return imagepng( $image ); |
| 244 | case 'image/gif': |
| Line | Code |
| 283 | |
| 284 | if ( null !== $saved ) |
| 285 | return $saved; |
| 286 | |
| 287 | return $image->save( $filename, $mime_type ); |
| 288 | } else { |
| 289 | _deprecated_argument( __FUNCTION__, '3.5', __( '$image needs to be an WP_Image_Editor object' ) ); |
| 290 | |
| 291 | /** This filter is documented in wp-admin/includes/image-edit.php */ |
| 292 | $image = apply_filters( 'image_save_pre', $image, $post_id ); |
| 293 | |
| 294 | /** |
| 295 | * Filter whether to skip saving the image file. |
| 296 | * |
| 297 | * Returning a non-null value will short-circuit the save method, |
| 298 | * returning that value instead. |
| 299 | * |
| 300 | * @since 2.9.0 |
| 301 | * @deprecated 3.5.0 Use wp_save_image_editor_file instead. |