Latte\Compiler::escape PHP Method

    private function escape($s)
    {
        return preg_replace_callback('#<(\\z|\\?xml|\\?)#', function ($m) {
            if ($m[1] === '?') {
                trigger_error('Inline <?php ... ?> is deprecated, use {php ... } on line ' . $this->getLine(), E_USER_DEPRECATED);
                return '<?';
            } else {
                return '<<?php ?>' . $m[1];
            }
        }, $s);
    }