dashboard_php_nag_class( string[] $classes )

Source

File: wp-admin/includes/dashboard.php

function dashboard_php_nag_class( $classes ) {
	$response = wp_check_php_version();

	if ( $response && isset( $response['is_secure'] ) && ! $response['is_secure'] ) {
		$classes[] = 'php-insecure';
	}

	return $classes;
}