Title: Plugin_Upgrader::upgrade_strings
Published: April 25, 2014
Last modified: February 24, 2026

---

# Plugin_Upgrader::upgrade_strings()

## In this article

 * [Source](https://developer.wordpress.org/reference/classes/plugin_upgrader/upgrade_strings/?output_format=md#source)
 * [Related](https://developer.wordpress.org/reference/classes/plugin_upgrader/upgrade_strings/?output_format=md#related)
 * [Changelog](https://developer.wordpress.org/reference/classes/plugin_upgrader/upgrade_strings/?output_format=md#changelog)

[ Back to top](https://developer.wordpress.org/reference/classes/plugin_upgrader/upgrade_strings/?output_format=md#wp--skip-link--target)

Initializes the upgrade strings.

## 󠀁[Source](https://developer.wordpress.org/reference/classes/plugin_upgrader/upgrade_strings/?output_format=md#source)󠁿

    ```php
    public function upgrade_strings() {
    	$this->strings['up_to_date'] = __( 'The plugin is at the latest version.' );
    	$this->strings['no_package'] = __( 'Update package not available.' );
    	/* translators: %s: Package URL. */
    	$this->strings['downloading_package']  = sprintf( __( 'Downloading update from %s&#8230;' ), '<span class="code pre">%s</span>' );
    	$this->strings['unpack_package']       = __( 'Unpacking the update&#8230;' );
    	$this->strings['remove_old']           = __( 'Removing the old version of the plugin&#8230;' );
    	$this->strings['remove_old_failed']    = __( 'Could not remove the old plugin.' );
    	$this->strings['process_failed']       = __( 'Plugin update failed.' );
    	$this->strings['process_success']      = __( 'Plugin updated successfully.' );
    	$this->strings['process_bulk_success'] = __( 'Plugins updated successfully.' );
    }
    ```

[View all references](https://developer.wordpress.org/reference/files/wp-admin/includes/class-plugin-upgrader.php/)
[View on Trac](https://core.trac.wordpress.org/browser/tags/6.9.4/src/wp-admin/includes/class-plugin-upgrader.php#L56)
[View on GitHub](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/class-plugin-upgrader.php#L56-L67)

## 󠀁[Related](https://developer.wordpress.org/reference/classes/plugin_upgrader/upgrade_strings/?output_format=md#related)󠁿

| Uses | Description | 
| [__()](https://developer.wordpress.org/reference/functions/__/)`wp-includes/l10n.php` |

Retrieves the translation of $text.

  |

| Used by | Description | 
| [Plugin_Upgrader::bulk_upgrade()](https://developer.wordpress.org/reference/classes/plugin_upgrader/bulk_upgrade/)`wp-admin/includes/class-plugin-upgrader.php` |

Upgrades several plugins at once.

  | 
| [Plugin_Upgrader::upgrade()](https://developer.wordpress.org/reference/classes/plugin_upgrader/upgrade/)`wp-admin/includes/class-plugin-upgrader.php` |

Upgrades a plugin.

  |

## 󠀁[Changelog](https://developer.wordpress.org/reference/classes/plugin_upgrader/upgrade_strings/?output_format=md#changelog)󠁿

| Version | Description | 
| [2.8.0](https://developer.wordpress.org/reference/since/2.8.0/) | Introduced. |

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