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<?php
private function message(){
return "<table id="print-area"><tr><td>example</td></tr></table>"}
?>

<?php
    public function PrintReceipt($content) {

    echo"<!DOCTYPE html><script type='application/javascript'>
              window.onload=function(){
                        var myWindow = window.open('', 'MsgWindow', 'width=200,height=100');
                        myWindow.document.write('" . $content . "');
                        myWindow.frames['print_frame'].document.title = document.title;
                        myWindow.document.getElementById('print-area').contentWindow.print();
                    }
    </script>";
}
?>

public function PrintReceipt($content) {

    echo"<!DOCTYPE html><script type='application/javascript'>
                    window.onload=function(){
                        var myWindow = window.open('', 'MsgWindow', 'width=200,height=100');
                        myWindow.document.write('" . $content . "');
                        myWindow.print();
                        myWindow.close();
                    }
    </script>";
}