Source

File: wp-includes/class-wp-recovery-mode-email-service.php

private function get_plugin( $extension ) {
		if ( ! function_exists( 'get_plugins' ) ) {
			require_once ABSPATH . 'wp-admin/includes/plugin.php';
		}

		$plugins = get_plugins();

		// Assume plugin main file name first since it is a common convention.
		if ( isset( $plugins[ "{$extension['slug']}/{$extension['slug']}.php" ] ) ) {
			return $plugins[ "{$extension['slug']}/{$extension['slug']}.php" ];
		} else {
			foreach ( $plugins as $file => $plugin_data ) {
				if ( 0 === strpos( $file, "{$extension['slug']}/" ) || $file === $extension['slug'] ) {
					return $plugin_data;
				}
			}
		}

		return false;
	}