old-versions.php

<?php
namespace dd32\WordPress\AddFromServer;

class Plugin {
	public static function instance() {
		return new Plugin();
	}

	protected function __construct() {
		global $wp_version;

		$error = sprintf(
			__( 'This plugin requires WordPress %1$s or greater, and PHP %2$s or greater. You are currently running WordPress %3$s and PHP %4$s. Please contact your website host or server administrator for more information. The plugin has been deactivated.', 'add-from-server' ),
			MIN_WP,
			MIN_PHP,
			$wp_version,
			phpversion()
		);

		// Handle activation gracefully with a block screen.
		if (
			isset( $_REQUEST['action'] ) &&
			(
					'activate' == $_REQUEST['action'] ||
					'error_scrape' == $_REQUEST['action']
			) &&
			isset( $_REQUEST['plugin'] ) &&
			PLUGIN == $_REQUEST['plugin']
		) {
			die( $error );
		}

		add_action( 'pre_current_active_plugins', function() use( $error ) {
			printf(
				'<div class="error"><p><strong>%s</strong>: %s</p></div>',
				__( 'Add From Server', 'add-from-server' ),
				$error
			);
		} );
	}
}