UninstallExtension.php

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<?php
namespace TYPO3\CMS\Install\Controller\Action\Ajax;

use TYPO3\CMS\Core\Utility;

class UninstallExtension extends AbstractAjaxAction {

    protected function executeAction() {
        $getVars = Utility\GeneralUtility::_GET('install');
        if (isset($getVars['uninstallExtension']) && isset($getVars['uninstallExtension']['extensions'])) {
            $extensionsToUninstall = Utility\GeneralUtility::trimExplode(',', $getVars['uninstallExtension']['extensions']);
            foreach ($extensionsToUninstall as $extension) {
                if (Utility\ExtensionManagementUtility::isLoaded($extension)) {
                    try {
                        Utility\ExtensionManagementUtility::unloadExtension($extension);
                    } catch (\Exception $e) {
                        return $e->getMessage();
                    }
                }
            }
        }
        return 'OK';
    }

}