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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.
| Line | Code |
|---|---|
| 335 | * @since 2.9.0 |
| 336 | * @deprecated 3.5.0 Use wp_save_image_editor_file instead. |
| 337 | * |
| 338 | * @param mixed $override Value to return instead of saving. Default null. |
| 339 | * @param string $filename Name of the file to be saved. |
| 340 | * @param WP_Image_Editor $image WP_Image_Editor instance. |
| 341 | * @param string $mime_type Image mime type. |
| 342 | * @param int $post_id Post ID. |
| 343 | */ |
| 344 | $saved = apply_filters( 'wp_save_image_file', null, $filename, $image, $mime_type, $post_id ); |
| 345 | |
| 346 | if ( null !== $saved ) |
| 347 | return $saved; |
| 348 | |
| 349 | switch ( $mime_type ) { |
| 350 | case 'image/jpeg': |
| 351 | |
| 352 | /** This filter is documented in wp-includes/class-wp-image-editor.php */ |
| 353 | return imagejpeg( $image, $filename, apply_filters( 'jpeg_quality', 90, 'edit_image' ) ); |