lse || strpos( $_SERVER['SERVER_SOFTWARE'], 'LiteSpeed' ) !== false );

/**
 * Whether the server software is Nginx or something else
 *
 * @global bool $is_nginx
 */
$is_nginx = ( strpos( $_SERVER['SERVER_SOFTWARE'], 'nginx' ) !== false );

/**
 * Whether the server software is IIS or something else
 *
 * @global bool $is_IIS
 */
$is_IIS = ! $is_apache && ( strpos( $_SERVER['SERVER_SOFTWARE'], 'Microsoft-IIS' ) !== false || strpos( $_SERVER['SERVER_SOFTWARE'], 'ExpressionDevServer' ) !== false );

/**
 * Whether the server software is IIS 7.X or greater
 *
 * @global bool $is_iis7
 */
$is_iis7 = $is_IIS && (int) substr( $_SERVER['SERVER_SOFTWARE'], strpos( $_SERVER['SERVER_SOFTWARE'], 'Microsoft-IIS/' ) + 14 ) >= 7;

/**
 * Test if the current browser runs on a mobile device (smart phone, tablet, etc.)
 *
 * @since 3.4.0
 *
 * @return bool
 */
function wp_is_mobile() {
	if ( empty( $_SERVER['HTTP_USER_AGENT'] ) ) {
		$is_mobile = false;
	} elseif ( strpos( $_SERVER['HTTP_USER_AGENT'], 'Mobile' ) !== false // Many mobile devices (all iPhone, iPad, etc.)
		|| strpos( $_SERVER['HTTP_USER_AGENT'], 'Android' ) !== false
		|| strpos( $_SERVER['HTTP_USER_AGENT'], 'Silk/' ) !== false
		|| strpos( $_SERVER['HTTP_USER_AGENT'], 'Kindle' ) !== false
		|| strpos( $_SERVER['HTTP_USER_AGENT'], 'BlackBerry' ) !== false
		|| strpos( $_SERVER['HTTP_USER_AGENT'], 'Opera Mini' ) !== false
		|| strpos( $_SERVER['HTTP_USER_AGENT'], 'Opera Mobi' ) !== false ) {
			$is_mobile = true;
	} else {
		$is_mobile = false;
	}

	/**
	 * Filters whether the request should be treated as coming from a mobile device or not.
	 *
	 * @since 4.9.0
	 *
	 * @param bool $is_mobile Whether the request is from a mobile device or not.
	 */
	return apply_filters( 'wp_is_mobile', $is_mobile );
}
<br />
<b>Fatal error</b>:  Uncaught Error: Call to undefined function Automattic\WooCommerce\Admin\Features\OnboardingTasks\wp_is_mobile() in /home/khorsh32/public_html/wp-content/plugins/woocommerce/src/Admin/Features/OnboardingTasks/TaskLists.php:225
Stack trace:
#0 /home/khorsh32/public_html/wp-content/plugins/woocommerce/src/Admin/Features/OnboardingTasks/TaskLists.php(73): Automattic\WooCommerce\Admin\Features\OnboardingTasks\TaskLists::init_default_lists()
#1 /home/khorsh32/public_html/wp-content/plugins/woocommerce/src/Admin/Features/OnboardingTasks/Init.php(36): Automattic\WooCommerce\Admin\Features\OnboardingTasks\TaskLists::init()
#2 /home/khorsh32/public_html/wp-content/plugins/woocommerce/src/Admin/Features/Features.php(139): Automattic\WooCommerce\Admin\Features\OnboardingTasks\Init-&gt;__construct()
#3 /home/khorsh32/public_html/wp-includes/class-wp-hook.php(308): Automattic\WooCommerce\Admin\Features\Features::load_features('')
#4 /home/khorsh32/public_html/wp-includes/class-wp-hook.php(332): WP_Hook-&gt;apply_filters(NULL, Ar in <b>/home/khorsh32/public_html/wp-content/plugins/woocommerce/src/Admin/Features/OnboardingTasks/TaskLists.php</b> on line <b>225</b><br />