Sometimes, one extension’s ability to function depends on the presence
of another extension. The
pm_Extension
class is used to collect information and perform basic operations on
extensions:

• Retrieve information on installed extensions,
• Check extensions version, state,
• Install/uninstall, enable/disable extensions.

Retrieving Extensions Data

Use the following methods to retrieve information on installed
extensions.

• getExtensions()
  - Retrieve the list of all installed extensions,
• getById($id)
  - Get the extension by its identifier.

The following code retrieves all installed extensions, then fetches
their IDs and activity states.

$extensions = pm_Extension::getExtensions();
foreach ($extensions as $extension) {
    $extension->getId();
    $extension->isActive();
}

The following methods fetch the extension’s data:

• getId()
  - extension ID,
• getName()
  - extension’s display name,
• getVersion()
  - version number,
• getRelease()
  - release number,
• isActive()
  - extension’s activity state.

The following code retrieves the WP Toolkit extension (ID:
"wp-toolkit"), then fetches its display name and activity state.

$extension = pm_Extension::getById("wp-toolkit");
$extension->getName();
$extension->isActive();

Controlling Extensions

The
pm_Extension
class also provides methods to enable and disable installed extensions,
and to install and uninstall extensions:

• enable()
  - change extension’s state to enabled,
• disable()
  - change extension’s state to disabled,
• installById()
  - install the extension specified by its ID,
• installByUrl()
  - install the extension from the specified URL,
• installByFile()
  - install the extension from the specified file,
• uninstall()
  - uninstall the extension.